i am looking to build a 240 gallon plywood tank. the demensions will be 72"x24"x31". how thick should the wood be? what thickness of glass do i need? a very safe thickness please i have a 2 year old daughter roaming my home. also, what type of paint would you use for the inside of the tank? my father, who has been breeding discus forever, suggested a resin called PondArmor. i plan on fiberglassing the whole tank so that wouldn't work for me. any input greatly appreciated, thanks