DrTim’s Aquatics Freshwater Eco-Balance Probiotic Solution – for Freshwater Fish Tanks, Aquariums – Block Unfriendly Organisms, Promote Optimal Water Quality – 100% Natural – 64 Oz.

Dr Tim's is the only bacteria I use in my 10 fish tanks. Its awesome

Really not sure about the quality, because I cannot find any expiry date on the container. Any organic product will have expiry date. So, mine could be expired already. Pouring such product to my tank does not make me feel comfortable. On the other hand BAC+ has clearly marked the manufacture and expiry dates.

I use this bacteria on a regular basis for my fresh water aquarium. Highly recommended. Keeps my 2 large aquariums properly balanced with beneficial bacteria.

I guess it’s doing it’s job. My aquarium water looks clean and fish are healthy