I would give your stock to me. And then buy 300 rosey reds for that tank and 1 common pleco.
Couple stingray and pick your type of geos.
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No one reads anymore... You could try a fire eel or TT eel, but only if you could find one large enough. For a cat I'd get a tig or a jur. Flagtail is a must IMO. RTM should fit your tank just fine. Also I would suggest H. Bocourti and H. Pearsei. Both large "peaceful" cichlids.