hmm...i think you wouldn't be able to have that many fish in the size tanks you're looking to buy, i have my oscar in a juwel rio 100gal and he seems to be one big poop machine. maybe you could just get one oscar in a 75 gal. but if you did put all the fish you mentioned earlier on in such a small sized tank, you would have to keep on doing so many water changes and worry about keeping all the water stats stable, IMO it's not worth all the stress and worry. better to get an oscar, and be rewarded from his health and happiness.
