they look thirsty as fuck, give them a decent top watering, ph 6.0 and ec 1.0 pour a couple of jugs in from the top. looks to me like the roots have not reached the water? but really we need more info, how long have you had them, when did they start looking like this, did you just transplant them? where are the clones from? hope it's not broad mites, but no way to know without a lot more info about the life of those plants up to now.
Wow well at that humidity it will only take an hour or two for the air to drink your pots dry. My advice is to get an LED like a quantum board or COBs instead of the 600 because it will lower your temps a lot and raise your humidity a lot.
Wow well at that humidity it will only take an hour or two for the air to drink your pots dry. My advice is to get an LED like a quantum board or COBs instead of the 600 because it will lower your temps a lot and raise your humidity a lot.
Does your exhaust fan have a speed controller? You may try and slow down the fan which should help with the humidity, unless you are living in an arid area.humidity is really low on the digimeter shows like 20-30% with humidifier on.
^^ what he said ^^Bring the humidity to at least 45%.
Start misting those clay pellets.
A moist towel hanging inside the grow tent will also help bring the humidity up.