Fluval Cycle Biological Enhancer, Aquarium Water Treatment, 8.4 Oz., A8349

Just upgraded my rating to 5 stars, after tentative 4 star rating, now that the product has proven itself! HIGHLY RECOMMENDED . . . tank is crystal, crystal clear after use while adding many new fish over just a couple of days. I immediately ordered it again. This is my new "best buy" for this type of product. **Initial Review** I've used Jungle StartZyme for years, then gave Tetra SafeStartPlus a try. They have worked very well but I was shopping for a better price/larger size for "start-up" bacteria. FluvalHagen is a respected, established name and the product description read better than others I was considering so I bought this. Have only used it once but could see the difference in the tank overnight. I noticed while reading through many of the reviews on these bacterial "quick start" products that many people had negative things to say to the effect that they are useless or don't work . . . They DO Work! The short version is the tank must "cycle" to make an aquarium work properly for the fish to survive and be healthy. No amount of filtration can substitute for the natural cycle of beneficial bacteria that "eat" the fish waste & uneaten food in an aquarium. Bacteria are needed to do that. These "bacteria in a bottle" make that happen much faster, instantly for the most part. I also noticed some users were adding this before they have fish in the tank . . . bacteria and fish work together. There's no point in adding this type of product to an empty tank, the bacteria need the fish waste so they have something to eat! The fish need the bacteria so they don't get sick/die in their own waste before the cycle is balanced. A couple of **hints** for those new to fish keeping: overfeeding is the biggest problem with fish. Do Not feed more than the fish clean up within 5 minutes! It's a lot less than you think. It's fun to feed the fish but every single bit that isn't eaten immediately pollutes the tank and that's what kills the fish. Better a few small feedings than one big one. Do Not put too many fish in your tank, the "rule" is an inch of fish per gallon of water and the bigger the fish the bigger the mess! Don't add all the fish you want at once. Set the tank up, add this product, then add your first few fish. That can be done the first day, you don't have to look at an empty tank but feed very sparingly. That lets you figure out how much to feed while the filter starts to populate with bacteria. If the water stays clear, doesn't smell and the fish are doing good, then you can add a few more fish. Use this "liquid bacteria" per the instructions until you have successfully established the aquarium, then do your regular water changes as there needs to be "new water" in and "old water out, about a 3rd of the volume every month. There's no substitute for regular water changes, light feeding and live bacteria in the tank regardless of the type of fish or aquarium . . . be it a jar with a Betta or a fancy set up full of expensive exotic fish.

Fisher happy and healthy and when I went to go get my water tested and I showed him the product I put in there. They said that was a good quality product so I will never switch to anything else again. It is easy to use. There's no cloudiness in the water. It's quality stuff. I say buy it.

Great stuff

Product work great to immediately cycle the tank. Had to do some intermittent water changes to keep the ammonia in check but nitrate levels Rose quickly indicating the bacteria was doing its job

If I could give 10 stars I'd do it. This works in 3 days - unbelievable !!! I've been reefing since 94 and this product is amazing. If you're quarantining fish in say a 10g tank, re-cycling is a real headache because it can take 30 days. This product is...yes I'm going to say it...a game changer. However I do break the rules. Instructions say don't add Ammonium Chloride but I do. My thought is...how do i know the bacteria is working? Risk a 150.00 fish only to find out the bacteria is bad? Nope . I add AC and do the 3 day product additions...seachem badge goes from green to lemon yellow in 3 days.

Didn't use it. Needed Biospira but not around anymore and so I ordered this thinking it was the same. It's not.

Love this brand. Helped immediate fish start. Obviously not the only thing used, but helped

I had a cycle that seemed to have stalled or be taking forever that was started with another brand of bacteria, etc. I ordered this in hopes it would work like other Fluval products. The five week dragging cycle was done in a week. This product works without a doubt, as I had high ammonia, nothing else. Within a week I had 0ppm ammonia and nitrite and 80ppm nitrate. It’s a pretty efficient product. I would definitely recommend this if you’re trying to cycle an aquarium. It will certainly speed that process up considerably. Thanks Fluval for yet another great product.

Vielen Dank! Top! Gern wieder !

Producto muy efectivo y recomendable

Works as intended

Worked quick. Worth every penny for a quick cycle. Use with ammonia for best results

good product....