I have a 90g where I'm planning on breeding firemouths. I want to add another species. I would love to add a severum, but I think it would be too much for the firemouths to handle or vice versa depending on size. Would a jack dempsey or a texas be too much for the firemouths even if they are a mated pair? Any recommendations or comments? Dimensions of the tank are 48x18x22