I am shopping around for a new tank for my JD and oscar. (In a 55g right now). What would be a good size tank for them? Not the bare minimum and not something completely ridiculously large. I am also debating about adding my 6 inch pleco in there. He is bigger than the jd and oscar. Would adding my firemouth be a bad idea? He is just a tad bit smaller than my JD, but he can hold his own. Input is greatly appreciated. Thank you all 