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Hello to all!

Question--I've been starting to get some yellowing seedlings recently, and I'm not really sure why. The seedlings in question tend to be older.

I grow all of my seedlings with an indoor LED setup in baggies. I'd love to post pictures, but honestly they aren't all that helpful given that this yellowing is somewhat subtle (it looks like a beginning to a problem, hence why I'd like to stop it before it gets worse).

Any input is appreciated!

Lack of N or wrong pH is the first place to start looking.
Picture? What is your mix?

Sorry! I'm in Quebec (USDA Zone 5) and grow all my seedlings with LED lights. Mix is 40% sand, 40% pumice, 20% soil.
Strangely enough, they've gone to more of a sickly green with some yellowing/orange tint on the sides.

They don't look all that bad to me. No need for the bags and high humidity anymore IMO.

Done and done! Thanks again.