Magnum 350 question

[lyquidphyre]

So I asked a question in the general hardware section, and I don't know if that area of the forum gets a lot of traffic, so I thought I'd ask here. I hate hate hate to duplicate post, but i don't know if my question will get answered there.

I have a magnum 350 and I plan to do this:
http://www.aquariumadvice.com/viewtopic.php?t=13431&highlight=cure+green+water

And I have used the magnum before to get rid of cloudy water (but w/o the diatom powder) and the only problem I have with it, is the current it creates. No matter how I position the intake and out take it bothers the fish and messes up my plants.

If I use a container (like they did in the link), to keep the powder in the tank, will that help with the strong current as well?