So everyone on this thread is lying?
My glass is 5/8" thick and my Dovii hits it so hard I can hear the thumps and thwacks throughout the house. If I put my hand on the glass, I can feel the power so hard thru the glass, I would swear it's eventually going to break....and at 13.5", he's far from his full potential size.
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My big male hits the acrylic so hard I don't think I could make a louder sound if I kicked the tank. It sounds like a gun going off....... The suction and impact is a very distinct sound, and it scares the %&$# out of me if I'm not ready for it! Hahaha!