I went to a large well kept public aquarium recently and was amazed at the hundred of thousands, maybe millions of aptasia on the resin corals (fake corals) and other ornaments used in the displays. All I could think of is if they'd toss in a few copper band butterflies they'd probably look like clown fish within a month having eaten themselves into a stupor. Seriously, it's amazing how aggressive that stuff is. And yeah, you're going to deal with aptasia if you deal with anything salt water. It's just one of those things. Nothing to get excited about, just meet it head on when you see it. Personally I have a couple of aptasia in my clownfish tank but really don't care. I kill them when they get too big, or put the rock where the copper band can get to it. Either way they eventually disappear.