In this video Seafriendlyreef talks about coral growing to large and creating less space for fish to swim. It is an interesting subject that I am sure a lot of people forget to consider when they first start stacking sticks in their tanks with a full stock list of fish. I have never run in this to this problem myself as I am more softy/lps guy but comment bellow if you have! Anyway, the tank in this video is a STUNNER, really deep SPS tank that has zero inches to spare.