Asking for a friend who got a huge acrylic tank to house a really big puffer and some others. I told him he should go with glass but no one ever takes my advice so... Now worrying that the foot long plus puffer might damage the acrylic at feeding time. He bites at the glass all the time at feeding time in the current tank. I've had acrylic damaged by things like urchins and learned the hard way, so i might just be over cautious with acrylic. But let me know if you have any experience with this so I can pass on the info.