The water doesn't gave BB in it. Were you using a hob
filter on the one that leaked? Did you move that over? And was that filter out of water for long? If you moved the filter over, the filter should have BB. but if the filter went a period of time without water in it, at least some of the BB would have died off. Only way to know for sure would be to add ammonia source and see if it breaks it down into nitrates. The quickest way would be to add a small amount of liquid ammonia, then you don't have to wait for a shrimp to rot. But only use the ammonia that does NOT bubble when you shake it. I've only been able to find it at ACE hardware. Hope it's still cycled for you!