Just like the title says how thick does glass need to be in order for someone to walk on it. When i build my 4,000 gallon tank i plan on having a platform above it that you can walk on and feed the fish from. any one have any clue on thickness? Im 200lbs myself so id like it to atleast support me, but if i could make it support, say 600lbs how thick would it have to be? it would be supported on all 4 sides, and if need be i could run supports down the center or every 4 or so feet. From a birds eye view the tank would be 12x8 and i would like the platform to be 12x4.