I have one culture, premade and purchased from the pet store. I've been feeding my cobalt tinc from it the past week, and she eats a LOT. I noticed that, though there were a good number of larvae in there, the number of flies might have already been dwindling a little (had her a week). I plan to likely get a kit to start culturing my own, but in the meantime I decided it might be beneficial to buy a second premade culture to switch back and forth and give them more time to reproduce and mature between feedings. So I picked up a second one tonight, but who knows how long it was on the shelf and it's OVERRUN with FF's.... like when I open it they come pouring out. I did try to dump a bunch into the first culture to even them out a bit, but it's still crazy. I was curious if there is any potential issue with having one so overcrowded, like if it would crash or something? I am not looking forward to feeding from that jar tomorrow because so many get out when I open it I am going to have to clean up each time, but hoping it will somehow dwindle down to a more manageable amount.