I'm putting a 30 gallon fish tank on a bookshelf. It's made of REAL wood, not particle junk and the shelf sits on metal thingys that stick out, the entire tank and evrything will weigh about 305lbs. What could I do to reinforce that shelf to be able to hold it. What if put another shelf underneath it or 2 or 3 of them, then it would spread the weight out. What do you think?