thinkin the same thing! better to have 2 filters runnning then just upgrade the water flow on a 2250 to go faster, that wont help with filtering, so im going to be saving up for a Fx5!! so Fx5 it is!! would my tank be fine with 1 oscar 1 sev and 3 firemouth ( the sick one is looking alot better ) with one eheim 2250 and Fx5 for filteration?