I am interested in raising tilapia or catfish and I am looking at various tanks to get a start. I was close to getting an IBC tote, but that didn't work out and I am looking at some rubbermaid tanks at Tractor Supply (here is a similar tank http://www.rubbermaidforless.com/rubber ... o-150.html). Is there any minimum depth for a fish tank? There seem to be lots of tanks that are around 2 feet deep, but I thought I read somewhere that you should have a minimum depth of 3 feet. It seems like there are lots of fish living in shallow water, but I wanted to see if anyone had any advice. Is there a minimum depth for fish tanks?