In Part 1, we covered what cycling is and why an uncycled tank kills fish. In Part 2, we walked through the three cycling methods: fishless, fish-in, and seeded, step by step.
In this part, we go deep on the product that meaningfully changes the cycling timeline for every one of those methods: Sunken Garden Good Bacteria.
There's a lot of scepticism in the hobby about bottled bacteria products, and some of it is earned. There are products on the market that claim to cycle a tank overnight, or to eliminate the need for cycling. These claims are inaccurate, and the products behind them often don't contain what they claim. The result is a category of products that experienced hobbyists have learned to distrust.
Sunken Garden Good Bacteria is not that kind of product. Here's exactly what it does, why it works, what it can't do, and how to use it correctly through every stage of a new tank's biological establishment.
What Sunken Garden Good Bacteria Actually Contains
Sunken Garden Good Bacteria is a liquid microbial supplement containing concentrated, live denitrifying bacterial strains in a stable suspension.
The critical word is denitrifying, and this is what separates it from most bacterial products available in India.
Most bottled bacteria products contain nitrifying bacteria only, specifically species that convert ammonia to nitrite and nitrite to nitrate. These are Nitrosomonas and Nitrobacter, the two bacterial populations that run the standard nitrogen cycle. Products containing only these strains accelerate the first two stages of the nitrogen cycle (ammonia → nitrite → nitrate) but stop there. Nitrate still accumulates in the water and must be removed through water changes.
Sunken Garden Good Bacteria contains denitrifying strains of bacteria that complete the process one step further; converting nitrate into harmless nitrogen gas that dissipates naturally from the water. This is the stage that terminates the nitrogen cycle. The result is a more complete, more stable biological system: one that not only processes ammonia and nitrite rapidly, but also actively reduces the nitrate that would otherwise accumulate between water changes.
In practical terms, this means:
- Faster establishment of the complete nitrogen cycle, not just the first two stages
- Lower nitrate accumulation between water changes in a mature tank
- More stable water chemistry over time
- Better long-term biological balance, particularly in tanks with heavy fish loads or planted setups where nitrate management matters
Why Natural Cycling Is Slow and What Good Bacteria Changes
Natural cycling relies on the right bacteria arriving in your tank from the environment. In a new, sterile aquarium, the starting population of these bacteria is essentially zero. They arrive slowly from the air, from tap water, from any surfaces the water contacts and must then find and colonise the filter media before they can begin multiplying in meaningful numbers.
This process is slow by nature. The bacteria that drive the nitrogen cycle have longer generation times than many other microorganisms. Nitrosomonas can take 7–10 hours to reproduce under optimal conditions. Building a colony large enough to process the ammonia load of a stocked tank from a starting population of near-zero takes weeks.
Sunken Garden Good Bacteria shortens this process by eliminating the arrival stage. Rather than waiting for bacteria to find the tank, you introduce a concentrated, active population directly into the filter media on day one. The colony begins colonising filter surfaces immediately, not after weeks of natural arrival and early multiplication from near-zero.
The practical effect: the cycling process that takes 4–6 weeks naturally can be reduced to 2–3 weeks with Good Bacteria dosed from day one and throughout the cycling period. This isn't a marketing claim; it reflects the biological reality that starting with a meaningful working population is fundamentally faster than starting from near-zero, regardless of how good the conditions are.
How to Use Good Bacteria: The Complete Dosing Protocol
During Fishless Cycling
Day 1 (Setup): Add 1ml per 10 litres of tank volume directly into the filter intake, with the filter running. The running filter distributes the bacteria throughout the media and tank surfaces; leave all equipment on throughout dosing.
Days 2–7: Dose 1ml per 10 litres daily. The first week is the critical bacterial establishment window; daily dosing continuously reinforces the developing colony as it begins colonising filter surfaces and multiplying.
Week 2 onwards: Dose after every water change. Water changes remove a small portion of free-floating bacteria from the water column. Re-seeding after each change keeps supporting the population as the colony matures.
At cycle completion: Continue dosing after every water change as part of your standard ongoing maintenance routine. This is not a product you use only during cycling; it's a product you use throughout the life of the tank to maintain biological stability.
During Fish-In Cycling
Day 1 (Fish arrive): Dose immediately- 1ml per 10 litres. Don't wait a day or two to see how the fish settle. The bacteria need to begin establishing the moment the fish start producing ammonia.
Daily throughout cycling: 1ml per 10 litres, every day, until both ammonia and nitrite consistently read 0 ppm. During fish-in cycling, the urgency is higher because fish are exposed to ammonia and nitrite throughout the process, and the faster the colony establishes, the shorter that exposure window.
Pair with Sunken Garden Anti Chlorine at every water change: Anti Chlorine's 15-strain beneficial bacteria addition compounds the effect of Good Bacteria. Every water change becomes both a chemical protection event and a biological reinforcement event simultaneously.
During Seeded Cycling
Day 1 (Tank setup with transferred media): Dose 1ml per 10 litres alongside the transferred established media. The seeded media provides the starting bacterial population; Good Bacteria expands and diversifies it, particularly adding the denitrifying strains that the transferred nitrifying bacteria alone may not provide in sufficient quantity.
Daily for the first week: Continue daily dosing as the colony establishes on the new filter media. Transferred bacteria need to recolonise new media surfaces. Good Bacteria supports this expansion.
What Good Bacteria Cannot Do
Being honest about what a product can't do is as important as explaining what it can. Here's where Good Bacteria's role has limits:
It cannot replace the wait entirely. The cycling process requires bacterial multiplication to sufficient colony density, and that takes biological time regardless of starting population. Good Bacteria shortens the timeline meaningfully (2–3 weeks instead of 4–6), but it does not cycle a tank overnight or eliminate the need to test before adding fish.
It cannot protect fish from ammonia in an overloaded tank. If a fish-in cycling tank is heavily overstocked, or if feeding continues at full rate during cycling, the ammonia load may exceed what even a Good Bacteria-supported colony can process fast enough. Reduce fish numbers if possible and underfeed throughout cycling.
It cannot substitute for water changes during fish-in cycling. If ammonia or nitrite climbs to dangerous levels in a fish-in cycling tank, the correct response is a partial water change, not a larger dose of Good Bacteria. Good Bacteria accelerates the biological solution; water changes address the immediate chemical threat.
It cannot fix other water quality problems. Good Bacteria addresses biological stability in the nitrogen cycle. It doesn't address pH issues, chlorine exposure, heavy metal contamination, or disease. These require the right targeted products (Sunken Garden Anti-Chlorine for chlorine and heavy metals, TCWS strips for testing, Misha products for disease).
The Six Cycling Mistakes That Undo Everything
Even with Good Bacteria dosed correctly, certain mistakes can set the cycle back significantly or restart it from near-zero. These are the most common and most costly.
1. Adding fish before the cycle is confirmed complete. The most common mistake. The tank looks ready. The water is clear. Wait for the test results, not the visual. Zero ammonia, zero nitrite, detectable nitrate: all three confirmed before fish go in.
2. Cleaning the filter during cycling. The developing bacterial colony lives in the filter media. Cleaning it, rinsing, replacing, or washing the media removes the colony at its most vulnerable stage. The filter does not get cleaned until after the cycle is complete. Not during.
3. Using unconditioned tap water. Chlorine kills bacteria. Every water change during cycling with untreated tap water partially destroys the colony you're building. Always dose Sunken Garden Anti-Chlorine before adding any new water.
4. Large water changes during fishless cycling. Water changes dilute the ammonia that the developing colony needs as food. During fishless cycling, change the water only if ammonia climbs above 4–5 ppm (which can inhibit bacterial growth). Small, targeted changes only or none at all if ammonia stays in the 2–4 ppm range.
5. Turning the filter off. Beneficial bacteria are aerobic. Without water flow carrying oxygen through the media, they begin dying within hours. The filter runs day and night continuously, throughout the entire cycling process and beyond.
6. Overstocking immediately after cycling. The bacterial colony that forms during cycling is sized to process the ammonia load present during the cycle. A sudden large increase in fish stock overwhelms it and can trigger a secondary ammonia spike in what appeared to be a fully cycled tank. Add fish gradually over several weeks after the cycle completes.
Product Details: Sunken Garden Good Bacteria
What it contains: Concentrated live denitrifying bacterial strains in stable liquid suspension
Directions: Shake well before use. Add daily after every water change. Leave filter and aeration running during and after dosing.
Dosage: 1ml per 10 litres of tank volume
Overdose safety: Does not affect aquatic life; safe to use generously
Safe for: Fish, shrimp, snails, fry, invertebrates, planted tanks, all substrate types
Available sizes: 50ml / 100ml / 200ml from ₹490
Best used with: Sunken Garden Anti Chlorine (every water change), TCWS Water Test Strips (every 2–3 days during cycling)
👉 Shop Sunken Garden Good Bacteria
In Part 4, the final part of this series, we cover how to confirm your cycle is actually complete, what changes in your maintenance routine after cycling, and the ongoing role of Good Bacteria in a mature, established tank.
👉 Continue to Part 4: How to Know When Your Cycle Is Done and What to Do Next
Questions about Sunken Garden Good Bacteria or the cycling process? Write to us at info@mayurdevaquascaper.com
