I am pretty confused as to which type of fish can live in my 110. I would like to get a green terror but could replace for a pair of real red terrors. I would also like a pair of jacks but besides those fish what other fish could i get? I was thinking i could get silver dollars but i would have to get a school and probably severums since they are peaceful and swim near the tank surface. My tank is 48"x18"x31".