Silicone

[shrimpchips]

GE 1 100% silicone rubber is probably the easiest to find at a hardware store and should be more than sufficient for securing your sump baffles.

[Chipie]

This silicone at Home Hardware says on the tube that it's safe for aquariums.(Sorry it's showing the place it's written in french ) I used it to make a sump without any problems.

[lorenz0]

Sweet thanks guys. I will keep my eye on the label for no anti-mold solution in it

[Ross]

BLUE one



NOT the red one.

[Wayne]

Originally Posted by Ross

BLUE one



NOT the red one.

+1, GE used to say aquarium safe but took it off for previously mentioned liability issues (didn't want to pay for water damage if a pane fell off)

Must say 100% Silicone! With no additives.

[shrimpchips]

There's two blue ones

Make sure it's silicone 1 not 2 (also in a blue tube) as 2 has mildew guard in it.

[fkshiu]

GE I if I'm simply doing resealing. GE SCS1200 if I'm building or attaching glass to acrylic.