Musty smell from grow

So for the last 3 days I've been getting a fairly musty smell in the grow closet. Really no particular smells up until then. I've had 2 successful harvest in this closet thus far And not experienced this smell. Everything is the same except for bigger light and I started auto feeding around 2 weeks ago. Previous grows i watered by hand once a day.. also had smaller plants
Growing in coco. Feed to 10%ish run off twice during lights on.
Temps 64/81F 29-48%rh. (These are max lows and highs)
Oscillating fan at canopy.
2 clip fans under canopy.
1 clip fan at LED light
Exhaust+filter and active intake
I've tried sticking my nose in certain spots. Plants smell like plants. Coco smells like... dirt? (Guess I never tried to smell it before lol) closet smells old and musty. Any thoughts fellow people? Hope I didn't forget anything
Plants are 22 days into 12/12

I'm guessing it's just the weed because they look fine and the environment is ok. They can get that smell in flower, especially good weed.

Skuxx said:

I'm guessing it's just the weed because they look fine and the environment is ok. They can get that smell in flower, especially good weed.

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I was hoping to lean that way. Other then I grew this strain just last run. Tho it was only 1 plant of this stain and not even 1/3 the size 1 of these. so maybe that's why I didn't get a noticeable smell

xrdamianxr said:

I was hoping to lean that way. Other then I grew this strain just last run. Tho it was only 1 plant of this stain and not even 1/3 the size 1 of these. so maybe that's why I didn't get a noticeable smell

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Were they all from seeds? Could be different phenos. Always keep an eye out for mold but I am thinking it's just the weed. Your environment is on point. I did the same thing my first few grows thinking the musty smell was something bad, but towards the end of flower the terpenes develop more. Cheers and hope you have a good harvest.

do you keep the door closed for lights off? Is that panda film on the walls? moisture can get trapped behind it.

Skuxx said:

Were they all from seeds? Could be different phenos. Always keep an eye out for mold but I am thinking it's just the weed. Your environment is on point.

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From clone. And thanks for your replies!

madvillian420 said:

do you keep the door closed for lights off? Is that panda film on the walls? moisture can get trapped behind it.

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Yes. Door closed 24/7. Yes. panda fim everywhere. And come to think of it. That was another thing I did differently this run. Added sheet of panda to cover the floor. I'll have to look into this

Wanted to revisit this... open the door to take a wif bout 5 hours into lights out.. not much smell. Again right at lights on (7 hours later) had to take a minute to find any smell so almost non existent.
30 minutes later after 1st watering. Instantly smells musty. Very Strong smell.
Will be pulling plants out in a couple hrs to clean, inspect and reevaluate