As MABJ mentioned, super glue (the ingredient you're looking for is cyanoacrylate) is perfectly fine. I use gel because it gives me more working time - usually a minute or two.
The brand I use - because it's cheap at the local hardware store - is Super Glue. Usually about a dollar for two tubes.
No ferts. It's UP Aqua Shrimp Sand - if you scroll through the journal a bit, you'll see some information about it.
Super glue gel? Is that safe for shrimps? O:
Do you have the specific brand that you use?
Are you dosing with ferts and what substrate are you using?
Sorry for the spamming if questions. LOL