I have a 100g tank with good hiding spots. I have 4 silver dollars, 1 firemouth, 1 jack dempsey and one oscar. The oscar and jack are roughly 4-5 inches now. The Jack Dempsey isn't overly aggressive (his attacks seem to just make sure the oscar knows his pecking order) but he does get a good one in every so often that will leave behind a small mark that seems to heal itself in a couple days. My question is, will adding a second cichlid with simular temperment as the jack divert his focus off the oscar? I try and keep the water temp just below 80 as I have heard 80+ will make the jack more aggressive. I know temperments are based per fish but I was wondering what others have done in the situation of keeping an oscar and jack together. Thanks for your help folks
