Advice For Stacking Slate Rock

Imcanadieneh

Fish Fanatic
Joined
Sep 3, 2008
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Michigan
I have the slate stacked up. The bottom level is in the sand as deep as t can go but hes real clumsy and keep ramming into it accidentally. When he gets his food he grabs it ten darts downward and hits the rocks. Is there anything that I could do to maybe "glue" them together that is tank safe?
 

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