i don't know...
he had a breathing problem around last summer for about a couple of weeks(breathing really hard and not eating)... he got over that.
then developed the problem again around a month before thanksgiving. but this time i got him to eat a little about 3weeks after it started.
then for thanksgiving holiday i went to relatives... came back to check up on them to find my heating went out in the house bringing tank temp down to 63F. all the fish(pacu, TSN, bullheads and the redtail) appaired to be fine except for the ongoing breathing problem for the redtail...
got the heat going... came back to find the heat out again. the water temp 66F but the redtail was on his side, dead.