FYI,, I did something like that, Used a hot glue gun, all temp, non-toxic to glue a bunch of large river type rocks to make caves for my fish, worked great, for a bit, found the glass balls they sell will not hold at all, the rocked worked intell I picked them up after being in water for a while, I have had many crash on me but i have one still standing, my Pleco lands on it and it stays intact.I have no idea if I should of done this or not, but it seemed safer then crazy glue like i was told to do. dont know if that helps or gives you any idea's, I would love some idea's on how to keep the rocks together permently.!!!
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