I think that would work okay in a long term tank IMO. Just get rid of the Kenyi man, I know it sucks but that's in your best interests trust me. If you do a 55 with a few Y.labs and some pecocks, you're gonna be sooooo much happier trust me. You'll enjoy your tank rather than dealing with aggression and dead fish.
Now talking filters...you'll get many opinions on that, that's a touchy subject lol. So I'll say this. On a 55g. I would say to turn that over at least 3-4 times per hour. The filter you are talking about if memory serves correct, fits about a 30g tank best. I think it is rated a 150 but actually a AC30 in normal terms, which is a filter for a smaller tank.
Canisters are good, I love my fx5's. You don't need to go to a canister though. You can save some cash. Look for a AC110, or if you want to go canister, low dollar but good is this....look on ebay for this
http://www.ebay.com/itm/SUNSUN-370-...hash=item48a0bddd3e:m:mRH1jM1r5TquUhGMYIUz27w
Thats actually a really good canister filter that does not cost much. Many of the guys in my club own that filter and love it.
Anyway...just tryin to help ya man. When I got back into cichlids some years ago I had some mix that was not good too. I had a 55g with some bad mix of haps & mbuna because I did not know better at the time. Had some that killed each other, took me years to see what worked with what. And I felt bad when I had to trade/give away fish that I owned It's all part of the game though. We have all dealt with trading in fish and dealing with the wrong mix and sorting it out to what works. Just part of being a cichlid owner.[/QUOT
You are right on point! Thanks Bro...