I have a 46 gallon bowfront and the bottom of the tank says "Tempered glass do not drill" So Im guessing its strong. I want to put in 17 pounds of rocks to make caves for my fish. I have 50 pounds of sand already in the tank + water. Will my tank support the 17 pounds of rocks? I dont want it to break. Yea im kinda paranoid lol.

it will be fine if you check youtube you will see people having sand floors and then focks every where for fish to have caves in.

id put eggcrate on the bottom, this prevents point loading of the rocks.
if you do, then it should be fine