Horseshoe Crab Swimming in Refugium

This is our new horseshoe crab swimming in our 300 gallon saltwater refugium. He is on the side where we keep the deep sand bed and are growing mangroves. There is a hole halfway up for them to get to the other side, but he needed a little help :) There are a few others in the tank with him and those are copepods and snails all over the glass. This refugium feeds our 837 gallon main tank located in a seperate room. Music by:http://www.bensound.com/index.php?route=product/search&search=soft&page=2