i have always used this http://www.homedepot.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10051&langId=-1&catalogId=10053&productId=100091111&R=100091111 said:I use that too
awesome said:Most local fish stores carry Aquarium-safe silicone, as does Home Depot. It says it right on the packaging. Check midway down on this page for some pictures I attached: http://www.dfwmas.org/Forums/viewtopic.php?f=5&t=88574&p=666341&hilit=marc+silicon#p666341