no whats gona happpen is the dovii or umbee is gona break that thin glass and hes gona have a bunch of water on the ground with a dead fish.... they are very strong fish and can when glass banging could easily break anything under a 180 gallon tank..... if he does acrylic hes gona have to watch out for scratching.... hes gona waste his money and learn and hopefuly not do it again...... ask anyone the sound they make when they hit the galss is crazy.......