LAB gone bad

i've used batches that have developed a little pink or grey mold on top by removing it before straining. but if the whey doesn't taste right, bad, or cheesy it shouldn't be considered a good batch.

iv had some green & white molds but never like a black mold would recommend carefully removing the curd from the whey then smell the whey ....is it rotten ..bad juju ...does it smell fine .. should be ok trust your nose it will tell u if its bad or not the only other concern i would think would be the amount of microbes u r harvesting the longer it set as the microbes feed the more that would have died off as the food ran out but id say as long as its not rotten it's fine LAB is really hardy and will beat out most bad juju as long as there's enough food and if all else fails compost it nature will make it great food in time