I have a hole that i drilled in my tank for a bulkhead. It is near the top brace, and has no visible cracks running from it. It is relatively shallow, and is on the OUTSIDE of the tank. There is no chip out on the inside whatsoever. Its a 40 Breeder. Does chip out on the outside of the tank cause much leak potential? It is fully covered by the bulkhead, and the gasket on the inside has good contact because the glass on the inside is clean..