i have 15 3" indo datnoids in a 60 gallon along with a 5" jardini. the jardinis n dats get along. the other datnoids seem to be having a great time but this one dat is always in the corner leaning against the glass. the other dats are perfectly stable but the one in the corner is black. i tap the glass and he swims away into the plants but when i go out and come back home hes in the corner again black! btw he is one of the biggest ones in the tank and i feed them 3 times a day (bloodworms) so their not starving... i do 40% waterchanges every week so its not the water... WHAT COULD IT BE?
