Could this be due to the cold?

[Renaissance Redneck]

Yeah thanks I've done all that, also was worried about a salt build up so flushed and refed. Only time will tell now [emoji111]

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Just beware the flush, Snickle. I don't recall ever having to do one. If you aim for 10 to 15% percent runoff every feeding/ watering, salt buildup should rarely be a concern. Just make sure to use racks, to keep your pots above the wastewater.

 

[SnickleFritze]

Ok so here's a few with lights out, I'm pretty sure its s ph/under watering problem so after a good flush I mixed a new batch up and upped the feed to 5 mins.

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[bartlancertp]

they should take 13F with no problem. Maybe some areas of your room are cooler than where your thermometer is?