At the moment there is 1 5in Pl*co, 1 4inOranda, 1 4inButterly Goldfish, And 1 2inBlackmoore. They are extreamly messy eaters. Right now I have a Penguin 170 and an Aquatech that does about 120 gph. In the past 4 months I have probably spent more on filters for this tank than anything else. What other filter would do what I need?