I'm thinking it was because the acrylic fit too snug. I remember reading that acrylic can swell a bit from water. Might have been just enough to put too much pressure on the glass.
Rushed clean up because I had to get to work. Everything seems fine, except my hammer looked pretty bad. I have no idea how long it was out of water... Everything is in a 5g bucket with a powerhead at the moment.
Man, I was about to get in the shower and was like, what is that noise??? It was my return pump going bonkers... Water everywhere! The tank sat on the kitchen counter so all the cabinets and drawers in that section were full of water... Smh...
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