I have an established 46 gallon tank with 3 Peacock Cichlids and 1 Yellow Lab. I have a pile of rocks and bunch of fake plants, so the fish have lots of places to hide. My water tests good, with a PH of 8.0 and Nitrates around 10ppm. No ammonia or nitrites. GH and KH were 5 and 6 last time I...