Sump question

[Mikefromaz]

I am putting a sump together and it didn't occur to me that I don't know which is the best silicone to use. I believe some are poisonous to fish but if true I wouldn't know which to avoid. Anyone?

 

[Twistofer]

Any Aquarium Silicone Sealant should be safe. The tubes are specifically marked which are aquarium safe.