Nice purchase, is this your first reef tank?

yea, no way of knowing without testing it

You'd better do the whole tank...

Beatiful galaxea, how's it doing so far?

Wow, beatiful tank, nice work!

I have used many different types of super glue gel, and imo as long as its gel, it doesn't really matter what brand you go with. The main differences will all be in the packaging / applicator, so buy it based on that.

Get a skimmer... mine broke and I went without one for a few weeks, and my tank got dirty very quickly... people say just do lots of water changes, but that's kind of a pain imo.