Joanne, I'm extremely 'relaxed' about this stuff compared to many Americans who have a mighty fear of botulism.
Understandable for low-acid 'canning', but if your ferment tastes tangy, then as far as I know it's too acidic for botulism.
My only test is: does it taste good?
If not,
compost it! It's unlikely to make you sick, but trust your tastebuds