Need some experienced perspective, please? I successfully drilled 2 of my 3 40G Breeders I’m using for my sump/refugium. I was placing the bulkhead on one, over tightened it, and it cracked. Then to make matters worse, while inspecting the other drilled tank, it has a crack also! Both cracks originate from the holes and are about 1.5-2” long. I loosened the bulkheads and applied silicone around the lip of the holes/bulkheads to ensure a better seal, and tightened them a bit less but still firmly. I siliconed the hell out of the inside and outside of both cracks, and both sure seem pretty solid. Next obvious question,… am I crazy to want to still use them? Also, the pics have a couple small spots where it appears the cracks have extended, but it is only silicone which I scraped off after taking the pics.