wvdeadhead
Aquarium Advice Apprentice
I have 2 small Oscars and a medium sized Pacu in a 30 gal tank. They have all lived together happily for about 6 months now. All of a sudden, one of my Oscars is starting to develop fin problems that look to be little nibbles taken out. Is it my Pacu doing it, or the other Oscar? When I'm around, they swim together fine, but who knows what happens when I'm gone. Is there anything I can do to catch the culprit or stop it from happening again.