I'm setting up a 2.5 gallon reef in a couple of months. I'm planning on buying an AC20, would that provide enough flow or should I pick up a power head too?
As long as you can arrange your rockwork so you don't have dead spots (areas with no current) the AC20 should be enough, if not then add a small powerhead like a Zoomed 104 or the tiny one made by Tunze.
