ok so heres my problem, i have a 75 gallon tank and when i test the ammonia in it its like a 4.0. my ph is like 8.6 because i hade the tank for chillids. the crazy thing is i have a flower horn in it right now and the thing seems overly happy all the time and not sick at all. i have tryed adding strees zyme, stable, and nutrafin cycle, all to no avail.... i do know my tap waters ammonia is quite high like a 2.0 i believe. the filters i have are an emperor 400 and a sump power useing a canister 304 fluval tgo pump the water back up. anyone have any idea why my ammonia seems so high yet my fish is thriving in every way?