Hobby stores are an easy place to find it - cyanoacrylate, its used these days for building model airplanes... (I have dozens of tubes of the stuff around).
The quality is higher with the modelling stuff. Look for CA
+, for example. Very thick and easy to work with.
180G build thread
180G All-glass with dual megaflows in a custom stand
AquaC EV-180 skimmer
250 pounds LR
160 pounds aragonite
Custom acrylic sump from GlassCages.com
2xPCX-40 return pumps
2x250MH 14K, 2x175MH 14K - PFO lighting, 2x65W PC
No-name 36W UV
Water General 125GPH RO/DI