i bought a flame angel yesterday and did a 2 hr aclimation then released him. he hid for the rest of the night woke up this morn he was swiming around the tank just fine. then one of my power heads came on by him as they alternate every 10 mins. now hes sitting upsidedown on the bottom of the tank breathing hard. the mandarin and hippo tang i put in the day before are dooing great. what do i do?