sea swirl

What is this thing. I saw it the other day and thought maybe the coral was sprouting a new branch (still new to reefs) I realize that's probably not it. But it's like a orange swirl last night I saw two antenna things sticking out. Any one have any idea? It has a hard shell and it's like an...

Selling two 1/2” sea swirls. I refurbished these. Both have new rubber seals and food grade silicone grease. The motors have both been rebuilt. Cleaned and lubricanted. They are super quiet $60 each shipped or $110 for the pair shipped

Pair of 3/4 inch Sea Swirls Both Work perfectly The one on the right was never used. I bought it as a replacement but switched to one inch so didn’t need it. The one on the left was in the water for a year and a half. 350 shipped for the pair.