Richordias out of control. Help!

Ok, they were cool at first, but I guess I am doing something right because I have 2 HUGE ones, over 6" across in my tank, and now each one is spitting out a baby every couple days. They remind me of the time I tried some green hairy mushrooms that were shrunk up at the LFS and after a week in my tank I had several 8" huge mushrooms and had to give them to my neighbor because they wouldn't fit in my 29G. The richordias multiplying has increased quite a bit since adding more T5HO lights. They leave a piece of their foot behind, move an inch or so, and repeat. My tank is starting to turn into a richordia jungle.

So, question is, how can I slow down the process? How can you remove a richordia from the rock without damaging it? Why are mine multiplying like crazy? I grabbed 1 richordia from his tank years ago.. now he only has one in his tank and I have what seems like 100 now from the 1 I took from him a few years ago. Why can't my other "nicer" corals/zoas spread as fast as these things do. LOL.

Ya, I am looking to completely remove a lot of them so the powerhead option sounds like the best one. If I cut them more than likely the base left behind will grow back into a few more. The one in the top right was my original ric. It has gone down the rocks, to the left, and back up to where that other giant one is. Last night when the lights were out and they shrunk up I notice what looked like 50 little babies ones under the bigger ones.. they are everywhere. I wish I could count them all, but no exageration, there has to be over 100 total.

If they were a better color I wouldn't mind as much. The one on top, its foot is so stretched out in all directions about the break another 6 babies off at any time, has now moved over to my nice zoa rock and is starting to split and the babies taking over the zoas. That was the point when I said ok, they are getting out of control and I need to do something.

Dang you Blossom and Woodright.. My lights go out on my tank at 11pm.. I was up till 12:30 looking at my tank and I have to get up for work at 5am.. you two are a bad influence.