i know i need more rasboras and ottos. but how many? its a 10 gallon with 3 guppies(2 are females), 2 harlequin rasboras and an otto catfish. I want to have a small school of rasboras, but I dont want my otto to get lonely either. I was thinking 3 or 4 more rasboras and 1 more otto. how does that sound? how many ottos do you need together? is 2 enough?