I think I am in trouble. Bought the other day two small black upside down catfish (one is 3 inch. the other 2.5 inch.) for my new 125 gallon tank (cycling). They are in a quarantine tank now. I got the new tank to move my 12 inch common pleco and my 6 (one year old) clownloaches from my 55 gallon. Now I read on the Internet and in some fishforums, they would kill each other over time. Is that true? I always provide hidingplaces like caves etc. Should I only keep one?