Eheim 2217 (Filtering a 125)

[Big_Kill]

If you poured the contents of your tank into a giant funnel and into the intake of a 2217, it would probably remove all ammonia and nitrite as this filter is excellent at bio-filtration. But it simply doesn't have enough flow to reach all areas of a 4 foot tank, forget about a 6 footer.

This is exactly what I'm saying. There will be dead spots in the tank. And since I don't want powerheads Im going to have to get a bigger canister and/or use an hob or a second canister.