Question about cinnamon in fruit fly cultures

Mr. J hahaha

Established Member
Ok so I have been doing cultures for a little while like 2-3 weeks now and It has been smooth sailing until today. I started new cultures but this time my media was premade and was stored in the fridge. I let it sit out for atleast 4-5 hours to warms up to room temp. I added cinnamon to the top of the media like I always do and I added my flies after their bug blade dip like normal. I left for another 3-4 hours and came home and checked on them. But all the flies was dead. Now for my question, will cinnamon kill the flies? Is it something I’m messing up?

I added cinnamon till there was a thin layer on top of the media.
 
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