So I at some stage in the near future will be buying either a 5 or 6 foot tank for African cichlids more than likely mbuna, from what I have read its very important to over filter. I've been looking at the fluval range specifically the 406 and the fx5. Here in Australia there is about $100 difference between the 2, so for something around the 80-120 gal mark which would work better 1 fx5 or two 406s