Instant Ocean HF-1 HoldFast Epoxy Stick for Fish & Reef Aquariums, 4-Ounce, 113-Gram

I used this epoxy to hold frags and rock together. Cured underwater. Only negative is that it cures bright white instead of purple. Easy to fix by using rubble to hide it.

I don't know if its the type of frag I tried to use or maybe I got a bad batch or maybe I don't know how to mix it right but it didn't hold good for me and an hour after I put it in my tank it left I big gap on the side of my frag because it opened up and it doesn't look good on the other hand my buddy has had better luck with one he bought but he is just sticking it to frag plugs and then to rocks maybe that's what it's meant for but for what I needed it for it did not work

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It's not as easy to get damp pieces to stick as it would say it is. It holds well but having everything completely dry would be best. However that can be difficult under water. Take some practice and make it work and it will hold.

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This may be ok if you are using it before the rocks are put in aquarium. But if you are using it in a existing aquarium it does not set up well under water,and you have to wait about eight minutes for it to start hardening.

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great product that I used to create a custom aqua scape out of live rock for my salt water aquarium. i recommend this one over the red one as it blends in PRE coralline growth.

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