just a thought..I hope you siliconed those rocks together in groups, They could fall and crack the glass, I'd be careful with the ones holding down the wood also. When making large rockpiles, it's a good idea to get some eggcrate material from Lowe's , Home Depot or similiar store....lay that on the bottom before you add substrate, that disperses the weight of the rocks and prevents high pressure areas from the rocks touching the glass bottom directly.
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