thinking of building a large cave made from lava rocks from my yard(not sharp ones tho)for my dovii tank.I have the rocks soaking in a bucket w/ bleach .tonight Im planning to scrub and boil them.Then Im going to try attaching them together w/ plumbers epoxy putty (nsf safe for drinking water) Do you think itll work? my biggest fear is that itll hold for a while and fall apart on top the fish
. Anyone ever tried this? I tried w/ silicone before (didnt hold small rocks welll)any suggestions are welcome.