Rock Glue to hold rocks together?
Can anyone recommend how to hold rocks together in an Aquarium.
I have some rocks, mostly lava rocks and I want to build like a mountain/cave for the fish however I don't want it to fall down during a water change or collapse on a scrimp.
Is there a way to hold the rocks together?
Aquarium safe silicone glue perhaps or maybe a product like
Fluval Sea Aquatic Epoxy Stick
Instant Ocean HoldFast Epoxy
Both these product have mixed reviews online say they don't really hold rock together that well.
Anything else I should try?