Hot glue for decorations?

No, as hot glue will slowly dissolve into pieces that can harm fish if swallowed, or if it gets stuck in their grills or digestive system (as glue isn’t digestible).

Try using silicone, fishing line, or even super glue that has been rated for water/aquatic usage.

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I just avoid all of this stuff. The decorations in my tank mostly are things that came out of the actual ocean.

I use silicone. I don't use fishing line; I am worried something will get stuck in it.

I've never figured why anyone would want to use a glue that cannot dissolve easily in water, and that could potentially kill the fish in a tank it it came apart.

I don't recommend using it.