The AC30 at low is rated for about a 15g tank. The soft corals you already have and plan to put in the tank require fairly low flow. I'd keep the AC30, which has an adjustable head. You can point it in any direction and increase the flow if necessary. But, more likely, you might need to keep the flow as low as it currently is so you don't stress your soft corals.
The soft corals you have do not want to be blown around by a powerhead.
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