I noticed when I returned from my trip an aptasia on one of the rocks I transferred from a friends tanks. Thinking it was the only one I bought some of that solution you squirt at it. Then I looked closer and there is another piece with lots of little ones on there. Is there any way to try to target or treat these two pieces before it spreads all over? The problem is that the two pieces are covered in coral. I have read many threads and posts on this but don't know really what the best approach here is. Thanks.