I wouldn't want or recommend rock in the vat. you would never get it all out. But it is a great way to move all the water without rock and coral in it. It's a standing offer for anyone as long as it gets returned.
Yea, we are really are in Hawaii! "we" are shopping and I am on my phone. Lol swam with a huge pod of dolphins on our first day (6 year olds 1st time snorkeling)