BEst glue or silicone to repair fish tanks ?

[Ultum4Spiderz]

using them for Tarantulas, what’s best glue or safes thing to use that’s not harmful to animals . And not too expensive preferably.
Best cheap ? Budget
Best premium ?
What do you use? I’ll take a pic but I got a single crack on a cage that needs fixed now . Got it free due to damaged 10gal .

 

[jrh3]

As for silicone this is what I use.

 

[moricollins]

If it's not going to be for an actual Aquarium use (i.e. filled with water) then GE brand silicone 1 works, don't get the stuff with mold inhibitors.