I'm looking into getting a 125 gallon tank or one around that size. I've had a 55 gallon tank for about a year and a half now and it's been running well and was looking into getting a bigger tank to fit into my living room. I have Under Gravel filtration in my 55g tank and was wondering what would be one of the best filtration systems for a large tank that would be good for a cichlid community tank with some large new worlds in it.