There is about 3/16th" of space or so around the perimeter of my leopard gecko's terrarium's tiles and also where the tiles overlap - it is 20 gallons long ~30"x12" and has a ~12"x12" tile at each end and then one in the middle overlapping them. There's just enough room for a small cricket, mealworm, or piece of feces to slide in between the tile and glass and also in a few places between the tiles. Do you think it would be safe to caulk it (with her in temporary housing for 24 hours for it to set of course)? I want something non-permanent- so not grout or concrete. I'm afraid that using particle substrate to fill the cracks would just invite feeders to burrow. Anyone have any suggestions?