I have another thread going and this subject came up. I have 3 black ray pups in a 125 gallon. I do 30% water changes every 3-4 days. my water parameters are; ph 7.8, Am 0, Ni 0, Na 20, Temp 78.8. I have 3 huge air bubble disks going in the tank and have a 30 gallon wet/dry. alot of oxygenated water. I also have a 25 watt U.V. sterilizer running. there are only 9 tetras and 4 plecos in the tank with the rays. the rays are 6+ inches each. they have been in the tank for almost 2 months now and are still extremely skittish. their bellies are pinkish towards the very middle. I see no cuts, wounds or infections. They were never on any substrate before i bought them but in this tank i have Peace river gravel. about 2.5 inches deep of it. this tank is very mature and stable. Could it be they have something wrong with them? Why would they have pink bellies and what can i do about it? I will try to get pictures when the lights go out (sinse thats the only real time they actively swim around) They hide almost all day.


