Hi. I have noticed that of my 4 black pahntoms sometimes they have raggedy fins. It is usually the dorsal or anal fin, and sometimes a hole through it, but not open at the top. Almost like a hole punch. It is also sometimes just a piece missing though. There is nothing in the tank that would be nipping fins (except maybe the other phantoms?) and it doesn't look like fin rot (I think?). It is always just between two rays of the fin, and never on the tail. Water stats are as follows (API master test kit).
Ammonia - 0
Nitrite - 0
Nitrate - ~20ppm
pH - 7.4
The other thing is when I check the day after, the holes are generally gone, then they might come back after a couple of days, then go again. So it's not an enormous problem, just wondered if anyone knew what was causing this and if it's preventable?
Ammonia - 0
Nitrite - 0
Nitrate - ~20ppm
pH - 7.4
The other thing is when I check the day after, the holes are generally gone, then they might come back after a couple of days, then go again. So it's not an enormous problem, just wondered if anyone knew what was causing this and if it's preventable?