By far the best glue I have used. I have tried so many different brands. I love this one because it is so thick. And they give you multiple tips in the package which is a great bonus!
IC-Gel Insta Cure Cyanoacrylate Gel comes in 20 gram and 50 gram tubes and is a widely used super glue within the hobby. With its quick dry time, and extra thick consistency you can use the IC-Gel on vertical surfaces and it will not run. It is great for heavier frags that you need to stand vertical or heavier rock work. IC-Gel comes in a tube like toothpaste which makes it very easy to dispense the amount needed, and when it comes down to the last few drops you can still get it out, unlike the harder plastic bottles.
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.