Can / should i set up a canister filter with my 90 gallon all in one? We just started stocking Africans (2-3"), have 15 now, thinking 25 is a good number. I've seen folks use both sump and canister, so I think will help with filtration and the clarity of my water. Thoughts? Also, I am thinking a Fluval FX4 would be sufficient if this set-up is worth wild. Any help would be appreciated.