I would recommend to go with a skimmer.
As for dry rock, ex. Marco rock are known to release PO4. Just make sure to strip as much PO4 from the rock prior adding them to your tank. You can search the forums on how to do this.
I recommend Eheim as well. You should add a check valve.
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SPS Dominated. Miracles 270g starphire C2C external overflow, BUBBLE KING 200, 60” 10 bulbs ATI PowerModule, Georeef CR618 with CarbonDoser Co2, Georeef KR618, Apex, WXM, PM2, 3 EB8, Auto feeder.
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