I have 2 sun fish aprox 1-2 inches long and a lmb 1-2 inches long, in a ten gallon now obviously cuz there small, planning on a transfer soon just wondering which type of tank to get 40, 55 , or 75 ? which would work best and does it matter if its a vertical or horizontal tank? Note I am also planning on adding another fish or 2. Also will sunfish and LMB eventually eat feeder guppies?