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My friend game me his tank he's had set up for 2 years. Durring the move we took all the water out except an inch or two in the bottom, putting the coral in 5 gallon buckets with the old reef water. When i set the tank back up i used the old water but did a 5 gallon water change for a 29g...

I know this photo isn't the best but can someone tell me what this is. So far no one has any clue ... it's kind of scaring me. This stuff is on 2 rocks in my tank. I also have several white mounts forming under the rocks that look like half a golf ball.