I thought about the rock and was thinking of only using like 3 pieces per can and really jam them in there so they wouldn't move. As I've said I'm not concerned about the rock too much so if I can't get them to lock together really well I just won't use it on the trip. Bah maybe I won't use it. I could silicone some pvc to the bottom(inside) of the cans a couple days before the move for the fish to have a hiding place. Yeah should be a 15hr drive as long as the weather holds, fingers crossed.
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