Filter Choices

[phantomlink]

Alright, heres my current setup:

125 gallon community tank - 2x Aquaclear 110, 1x Eheim 2217
70 gallon Pictus catfish tank - 1x Aquaclear 110
50 gallon temp catfish/redtail shark tank- 1x Ehiem 2217

I plan on going out of town to the fish store tomorrow to pick up another Eheim 2217 or two so I can have a quiet room without the over the back filters. I plan to move the mature media into the new canisters so they will be good to go from the start. But heres my question:

On the store's website it says they are sold out of Eheim 2217's but they might have some in stock at the store. If they dont, should I get a Fluval fx5 for the main community and move its Eheim over to the 70 gallon? I want all my tanks to use a canister and I read for canisters you need ~4x flow rate. The Eheim's are rated at 256gph with media so that leaves me at:
50g - 5.12 flow rate
70g - 3.65 flow rate
125g - 4.1 flow rate ( if I get a 2nd Eheim and not a Fluval )

The Eheim's are $200 each but if people like the Fluval Fx5 then for only $340 I can get one of those with a flow rate of ~525 with media then my flow rate will be at 4.2. Do those rates sound good at all? I would like to get a nice current in the tank for some of my fish but I need surface agitation so I'll prob just get another bubbler for the tanks and put the spray bar somewhere around the middle instead of pointing to the top

 

[phantomlink]

Also note if I get the fluval, I will only have one filter for the community tank right now. I know most people prefer two filters for larger tanks including myself but I cant spend that kind of money right now im still paying off the tanks. Maybe a few months from now im already going to have $300 in aquaclear filters I wont be using anymore

 

[DrRob]

Just a random thought, have you measured the gap you're putting an FX5 into, they aren't exactly small things.

 

[phantomlink]

II'll have to look up it's size and the gap I have between the two tanks. I read it was the size of a five gallon bucket, and I have more room then that between them. I know the Eheim uses Ehfisubsrat while the aquaclear uses biomax. If I get two more eheims I hope that I can put biomax inside them cause I have no other way to cycle them