GE silicone II is safe to use and works great. what are you going to put in there? i would get either the black or brown b/c then if you miss a spot it doesn't look as bad. good luck!
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RES
WTF
FBT
Russian Tortoise
Hingeback tortoise
Leos
Lawsons Dragon
Aussi
Ocelot Gecko
0.0.3 Vietnamese Mossy Treefrogs
Oregon Newt
Japanese FBN
American Bullfrog
0.0.4 D. tinctorius
D. auratus
D. leucomelas
1.1D. imitator
0.0.2 imitator intermedius
1.1.1D. lamasi
Grandis Day Gecko
Mali Uro
0.0.4 Hourglass Treefrogs
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