As far as I remember from my freshwater days Amquel and Prime are pretty much the same thing, I believe the NovAqua is as well. You may be overdosing... Also if you had cyano and didn't take care of it's source it will most likely be back. I always suggest getting an RO/DI unit for tanks, that eliminates the need to add chemicals. If you are running FOWLR many people do just fine with straight tap, however many have problems. I would suggest treating the water before mixing the salt in. Personally I would stick to the prime and ditch the rest.