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Typically 100% aquarium safe silicone will not accept any type of paint.

While silicone is still tacky apply sand to it.

Home Depot landscaping lava rock is red we all know, but cheap, under $4/22lbs.
Their lava rock for the grill is usually black or much darker, $5/7lbs.
After all is said and done and in the tank for 3 months it will take on a new look.
 
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