thanks..i used 1/4" glass for that tank because its not really a tall tank. But in your case, if your tank is going to be taller than 2', I'd go with 1/2" thickness. I get my glass from Glasscages.com. I see your in VA, so ordering from them shouldnt be too expensive, because theyre in TN. They make truck deliveries to various cities. Their schedule is on their website. I know they will be in Manassas VA the same day they are coming here to Columbus, Feb 28th. I plan on posting more pics as soon as I put a couple more coats of resin on.