I've fixed many a small glass tank but if it's cracked at the hole then you need to completely cover that hole with a patch that overlaps the hole and crack by at least a couple inches. You then want to allow it to dry at least 24 hours, 48 would be better. Then you have to drill a new hole, why did the old one crack, is there stress on the bulkhead or fitting? Identify why it failed, that will give you a good idea how to proceed and how to prevent it from happening again.
Doug
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