I have an established Ciclid tank with 2 small and 1 medium sized Cichild. I also have two large Plecos in the tank. My tank is a 50 gallon tank with LED lighting. I keep the water brachish since Ciclids like a semi-saltwater environment. I wondered if Nualgi would hurt my cichlids? Also, how many bottles would I need to properly treat my tank?