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i think they need some flow not to much
i always start low and move them up. not all the way though
only time i had a problem with them i found a sundial snail
on them (must remove right away if you see one)
hope this helps
check out this site look up aquarium pests on the left side of the page
i see them in my tank every now and then
don't bother anything that i can see
http://www.garf.org/
hope this helps