I've got 18 bristle nose in a standard 4 feet tank. 3 adult 15 young ones. I'm wanting to get Neons and Discus soon . I'm wanting another ground cleaner that could eat the left overs from the Discus and Neons that will be compatible with BN. Could you please let me no compatible fish that would not eat the young BN,Neona or cause harm to Discus or eat Discus Fry.