All those fish in one tank? Green terrors an oscars will fight to the death and knock down dividers to do so in my own experience. Correct me if I'm wrong but aren't FH supposed to be hyper aggressive? They do have red devil/midas in them as part of the hybrid making process, as do blood parrots I believe. The oscar should not be in with such aggressive fish in my opinion, but what does not work for some can work for others. I hope u have a BIG tank (500g+). cheers and good luck, Jim




