Tight. I couldn't decide on good soil! I went to Home Depot first looking for Fox Farm soil....no luck. Then I went to Walmart for the same thing with no luck, so I decided on just getting Miracle Grow Potting Mix....iono if that was the best decision but nothing else seemed better :/

Today I'm going to go get 2 fans from the shack after work. Do I really need to thicken the back? I dont think it would be a problem to cut out two spaces for the fans and install them. I really dont see a need for a thicker backside.