Wow, Dude! Sorry to hear it. I don't keep livestock in this tank. I worry about the end of fill release. I had it happen once and it just releases co2 at a high rate and bubbles off the last bit from the cylinder. But as you experienced, it can be bad. I'm still trying to find a PB reg that will hold that back. And Anthony's "Primer" is an excellent reference if you're looking to learn more stuff!
Nikon Pimp #084
"The legal quarter of tight lipped men, push for order, then repeat again." KTP