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All super glues will work great but they do set very quickly under water. Reef epoxy is a great option to hold larger rocks as well. Feel free to let us know if you have any further questions!
Super glue (cyanoacrylate) is widely used for mounting coral frags to plugs, rocks, and what ever you may need to attach them to. Super glue can also be used to bond rock work when aquascaping for a seamless look. We find that if larger gaps are needed to be bridged when aquascaping either building up layers of glue, or placing a smaller rock that fits in the gap and then gluing over the top works really well. Usually when using super glue with aquascaping we will take a small amount of large grain sand to help give the glue some texture and blend it into the rock as well.
Available in 4 sizes:
Watery snot By JC on 4/23/2016JC wouldn't recommend this product to a friendNot thick glue at all. Takes a long time to stick to surface.
Best superglue!! By Wayne on 2/18/2016Wayne would recommend this product to a friendBuy this and you'll say goodbye to all the other superglues out there.. lasts forever and the tip never gets really clogged. the glue doesn't stick to the plastic bottle