red texas will probably kill your other boys based on what ive heard. for a gt to have a 100 gallon tank alone seems a bit extreme, they dont get that large or aggro. if you get a 200 gallon tank i would say add whatever common cichlids you want. i would say ditch the firemouth and get pairs of whichever you decide to keep
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. What I would do is either get a Tex, GT, Devil but I would kinda pass on the Devil cause they grow very fast and would take out the whole tank. But a GT would be cool I have one that is now housed in a 180gallon and does really well with my Fire mouths and JD'S. Also props to you on running a FX5 great filtration.