electricity and water are very scary to mix...
May I ask why you don't take the rocks out to drill?
you can make a template of your tank out of cardboard wrap a garbage bag on it and then lay the rocks on that so you kinda get a feel for the dimensions of the tank.
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Always looking for the next best coral...
90g starphire cube/400mhRadium20k/2 XHO/2x27w UV/2x39w T5/ 3 Trulumen led strips
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