How much do I need for setting up a new 75g freshwater tank?

After tank is set up, keep everything running except for lights and if you are running a saltwater tank keep the protein skimmer off. Pour in half of 16.9 oz. bottle upon set up, On the 8th day ,pour the rest in. In my experience on day 14 your tank is cycled, however testing tank water , 1 time I had to wait 16 days. It is recommended to dose the tank when new arrivals are added, I did this for 1week then stopped, I have used this item for 15 years when the original was sold under the CYCLE name which came in 8oz. and 16 oz. Works every time.

What size bottle is recommended for a 6 gallon tank?

The 8.4 oz seems like a better deal overall compare to the 1oz and 4 oz. its a little cheaper. However, you would need this every time you do a water change. Some people don't add more when then do a water change, but when you take out water from your tank, your taking out some of the bacteria, thats why its necessary to replace the bacteria. This is by far one of my favorite nitrifying bacteria. This is good to cycle a tank. Plus this bacteria is something you cannot overdose. So for a six gallon tank you can add three to 4 full caps to get a good amount of bacteria in there to start the cycle. Then you can add your first fish. After you add your first fish wait for a few weeks before you add more fish. The first initial fish will help feed the bacteria you put in. This way over a few weeks it will create the ecosystem you want. To be honest Allie, some people add two much fish the first time they get an aquarium and its a big mistake. Eventually they may have a lot of fish loss due to they tank not being a ecosystem. You want to make sure you create the ecosystem first before you add a lot of fishes. Thats why for the size of your tank one fish is ok with the addition of the bacteria will help create the ecosystem. After a few weeks you can add more. Also if you are doing tropical or saltwater fish make sure you have a heater. If your doing goldfish your not required to have a heater. Acclimate your fishes well too. If you have any more questions feel free to contact me.

What size do I need for a 40 gallon breeder tank?

The directions state 25 ml per 10 gallons on day 1 (100 ml) and then 10 ml per 10 gallons on day 2 and 3 (40 ml per day) so a total of 180 ml for your 40 gallon breader. I do a sustainment treatment every week of 5 ml per 10 gallons (another 20 ml). I think this is a great way to get and keep a large colony of beneficial bacteria. Good luck with the new tank!

If I put this in a new tank how quickly will it cycle the tank? Will the bacteria stay in the tank or die off after a bit? Is it cycled permanently?

I would recommend API Stress Zyne Plus. My fish kept dying for the first few weeks. It took almost 8 weeks to for the tank to cycle. So get 2 or 3 fist to start and nothing fancy. Keep testing for Amonia levels. Once the tank cycles, it should be at 0. Then you can get fish you want to keep.

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🐠 Keep your tank thriving—because your fish deserve the best!

INSTANT AQUARIUM BOOST - Kickstart your tank’s ecosystem with a potent bacterial blend that works immediately.
LONG TERM WATER HEALTH - Regular use prevents harmful bacteria, ensuring a thriving, crystal-clear environment.
STRESS FREE TRANSITIONS - Perfect for new setups, fish introductions, and filter changes to maintain water balance.
VERSATILE FOR ALL TANKS - Effective in both freshwater and saltwater aquariums, making it a must-have for any aquarist.
AMMONIA NITRITE DEFENSE - Protect your aquatic friends by neutralizing toxic compounds before they harm your fish.

FluvalCycle Biological Enhancer is an 8.4 oz. all-natural water treatment that introduces beneficial bacteria to eliminate ammonia and nitrite, creating a safe and stable habitat for freshwater and saltwater aquariums. Ideal for new setups, fish additions, and filter changes, it ensures long-term water quality and fish health.

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