well i notice some of my loaches were lying on it side and thought ya know its normal cause thats how they sleep the next day i found 2 of my 3"-4"ers died. my tank temp is about 84 the other 6 loaches are swimming all nicely i just cant put my finger one it. any suggestions? tank mates are 2 aros but on the 3-4" side and some geophagus and tank is 125 gallon.