Hello MFK, I currently have a 90 gallon tank. I just got done ordering a male jack Dempsey, pictus catfish, 2 clown loaches, green terror, and a chocolate cichlid. I usually stick to bala sharks for school fish but I've using them for about 2 years. I would like something new. No tetra's or swordtails because I have had bad experience with those. Plus I would be worry about my Gt and JD eating them. How will Hatchet fish or silver dollars work? I really like those two. My mom has a 80 gallon with a Oscar and a school of dollars. Another schooling fish I was considering was the tiger barbs. If anyone with any help and experience can reply to this I would greatly appreciate it.