Curious --- anyone out there that has done their own acrylic sump experiencing salt creep near the joints? Got a little concerned -- but, making sure I'm not over-reacting? I made an acrylic sump --- foot print measures 24" x 42" (three internal sections). Anyway, there isn't any leaking of any kind, all seems to function well, but I just noticed that along some of the joints, there seems to be some salt creep. Possible for that to happen without concern of leaks?