Well I was hoping he'd mow the sand but he has been doing good on the rock. I cyphoned the sand for him since he's been slacking. It isn't neccesarily a clean tank because I've been gone for the past week and my dad only does the mag float, there is some coraline on the front I need to get but since a mag won't hit it my dad doesn't bother with it. I will get a full tank shot in a minute.