My tank has been up and running well for 2 years now. Today I swapped out the lights on the tank for some Noopsyche K7 Pro III's. About an hour after that a rather large (4" diameter) aiptasia suddenly showed up on the side of one of the base rocks. I've checked that tank daily for two years and would have sworn there weren't any in there. The only thing I can guess at is that it was hiding somewhere and moved. Any thoughts?