I'm in the market for a large predator, but need opinions on what to get. The purpose of this fish will be to cull, and ideally it would be able to quickly eat a 4-5" CA cichlid when full grown. I am moving in a 230ish gallon tank for this fish, 7'x2' footprint by 3' tall. The obvious choice would be a RTC, I've worked with them in the past in this context and they seem like the best, since they don't get injured by the spines and eat pretty much everything. But the maximum size being 5 feet might be a problem. Any suggestions? A smaller species of catfish with a similar mouth and appetite may be ideal, but I'm open to all suggestions (hence this being in the general section). Thanks in advance.