I have a 20 gallon with 5 pygmy cory catfish in it and asked a local fish store to order 6 more for me. I didn't realize that there were actually three different pygmy cory catfish and he ended up ordering me 6 habrosus instead of pygmaeus. So I ended up taking 5 of the habrosus and a pygmy cory as that was all he had, leaving me with 4 habrosus as one died and 6 pygmy for a 20 gallon with two honey gourami and 15 harlequin rasboras. Will these fish schoal together and be comfortable? Do I need more of the habrosus?