Invasion of the sponge!

I have a rock that I've wanted to move from the fuge into the display tank and this weekend I finally got around to it. I put it into the tank and suddenly noticed about 30 sponges! I had no idea they were even in the fuge. Anyway, not sure if they are pinapple sponge or QTip sponge but either way there's a ton of them. The rock itself is a tad bleached out but it'll purple up soon under the lights of the DT.