I looked for a similar topic but didn't see one so here goes....I have a community tank and like others have mentioned some fish are much more aggressive than others. What I do in order to help out the less aggressive fish is to put my hand a few inches under the water and release it in the current produced by the canister filter which pushes it down to those fish.

The only concern I have is there is more chance that the flakes are sucked up into the filter intake that could cause an ammonia issue.