I have nigeriatum males in a four foot tank along with siamese algae eaters, clown loaches, sterbai cats and all are doing well. There are also choc and gold australe males. The tank is heavily planted and I think that keeps them a lot happier. I would stay away from different males and females becauseyou don't want them to cross and also nothos because they like a bit of salt and the plants are better off without it.