Speedy said:
You should read the post on growing large Rhoms....The more current that better.
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For piranha species that live in area's with fast-flowing rivers (Rhoms, Elongs, Manueli's), that is true indeed.
For species that live in area's where the water flow is much lower (ponds, lakes, wetlands), like Redbellies, a powerhead is not needed, and often not even noticed by the fish (as my Reds do: they don't give a hoot about the powerhead I bought them...
) It certainly won't kill them, but there's no need to overexagerate (sp?) their importance...