No more Cory's for that tank. Maybe six female and two males with the catfish. Find a fish store willing to trade in guppies. I used to rotate adult guppies with young adults to keep the cycle going. With my 55, I once traded in 100 pair of guppies. I traded them in for a Marineland Emperor filter and 1 huge canister of Tetramin. I got a lot of equipment and food for free. I now live way out In the sticks so the drive to the LFS
is too long.