ok tank is made of plywood with a glass front.Has over 500 lbs of LR and 450 lbs of southdown sand in main tank.i run 3 400 watt mh getting ready to add 3 more soon just got the tank temp to stay down. Lets se i have 100 gallon fuge under the tank a 20 gallon fuge over the tank and 2 20 gallon...