this tank is a 29 gallon tank with 1 other jack dempsey, lemon oscar (temporary till big enough to go with big oscar) 3 tiger barbs, and 1 african cichlid (will be moved out tomorrow) the tank has been set up for about 2 months. and the jack dempsey is the oldest inhabitant of the tank. i came home and from his frontal fins (sorry i don't know what they are called) back is a light tan, or pail and up is his/her normal color. he is trying to swim using its frontal fins, but can only move them and his gills/mouth. if you need more info, i will see what i can do. my testing kit has been a little iffy, its a cheap old thing that i don't even know if works accurately.