my female clown has started to swim lathargic near my heater i bought them as a pair they were drip acclimated over 30 min period. ph 8.1 0 ammonia Onitries Onitrates she will do this swim to the middle of the tank for a short period then come back to her corner what could be the cause in odd behavior less. they were eating soon after adding them to the tank. the female come out when feeding but not too far.