Fish Safe Silicone
 

Where do you find fish safe silicone and what type do you buy? Every tube I looked at in Home Depot had some kind of toxic stuff in it.

go to home hardware. They carry a brand called weather sheild(or something close to that. It says safe for aquariums in big letters on the front. # tubes cost $9.99. Ive used and have had no problems

Wonder if it's safe to use it on exterior work? I'm not looking at building a tank, I want to seal around a few rocks on my backyard stream emptying into my pond.

G E silicone 1 clear, windows and doors, NOT kitchen and bath. is tank and fish safe. and would work on your rocks. they sell that stuff most places that sell hardware. even walmart
costs around $5

the kitchen and bath contains anti mold "stuff" which is not good.

Permatex Black, found at auto stores is also safe. Have use it in both my tanks.

GE SC1200 is strong and safe.