i'm going to make some more caves for my pleco and i'm wondering if slate with smoothed edges will work i'm going to use some tank sealent that wal mart sells to hold it to gether and i'm wondering if any of you have used it or if you recommend some other brand that a pet store might have![Big Grin :D :D](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)