"Great Stuff" spray foam coated in silicone for tank walls

[Bogertophis]

I have bought Aquarium landscaping foam to do things like this. It says it's fish safe. And I only use aquarium silicone in my enclosure, the ones with vinegar. But I am not sure of the longtime effects eather.
Still so many youtubers use this method and foam and their reptiles seem to be fine.

Fish are quite sensitive, so yes, if it says "safe for fish" that's what you want. (re- "aquarium silicone"- it smells like vinegar until it cures completely)

Hopefully all is well, I'm just very cautious, maybe because I know that harmful effects can be subtle & silent & take a while to be noticeable, & our pets deserve the very best care.