API STRESS ZYME Freshwater and Saltwater Aquarium Cleaning Solution 473 ml Bottle, Blues & Purples

It simply replaces all those starter kits as you can double the dose for a new aquarium to boost the biological filter. What a brilliant product! My guppies are happy with this.

Been using this for years. No problems and does it's job in conjunction with API water conditioner.

API STRESS ZYME has been a game-changer for my aquarium maintenance. Since I started using it, my tank stays cleaner for longer, and the water quality has noticeably improved. It's easy to use, and I appreciate that it works for both freshwater and saltwater setups. It helps break down organic waste, making the environment healthier for my fish. I highly recommend this product for anyone looking to maintain a cleaner and more balanced aquarium!

Bit pricey but works for regular use

I seemed to have a huge problem in my biorb 30l, which had been running for over 4 years, suddenly dyed and any new fish kept dying too. I tested the water for PH, Ammonia, Nitrate and Nitrite and everything seemed to be ok.I started adding this product to my tank on a weekly basis with a 20% water change. I then added neon tetra (which I have had trouble with in the past as they can be quite tricky to adjust to new water), and a month later and they are all there still! I guess this product must have been the solution and will now be part of my weekly tank maintenance routine.Also, this is much better value than at my local fish store so will always be buying via Amazon.

Two of my fishes nearly died, this solution cleared and cleaned the system. The fish tank has clear water since using solution.

API is the best brand product in the market for years! REALLY recommended it does the best job ever!! Can trust 100%

Used in aquarium, and works exactly as stated on container