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Righto and I thought I had algae problems! My tank suddenly looks sparkling...
Anyway, depending on your time frame I will think about 'cooking' those rocks. Will take a couple of months but the rock comes out sparkling and it will also take out some of the residual stuff deep inside the rock. I had some severe HA (ok I thought severe until I saw the photo) and dropped my rock into the black drum, two and a bit months on and they really look nice and clean now, overall more porous and not a hint of green. Going back into the tank in the next week or so and the test will obviously be if it stays clean.
As for critters, found a previously unknown carpet anemone after a couple of weeks which is now happily living in the main tank and my pistol shrimp that came with the live rock is still going strong in the bucket.
I agree with cooking the rock. It seems to help eliminate lots of nasties.

) and H2O2 dip them if you are so inclined.

