Cant you drill a hole through the glass then screw the wood on?
That could be an option, but drilling holes in glass isn't realy my speciality... And it's a bit of a permanent damage to a tank, would need to replace a complet glass panel if it doesn't work out or want reuse the tank for something els later. Drilling holes is bit to drastic measurment for an (maybe completely silly and failing) experiment. 🙂
But thanks for the input anyway..