HELP! Leaves starting to wilt

These plants are about 35-36 days old, are my first batch, and they're starting to die I think. Last week I noticed the leaves were starting to droop. I thought I may have over watered them so I let them get I little drier than I normally would until I watered them again. That didn't help anything and I'm just wondering if you guys have any ideas as to what's happening. The only nutes I'm using is FF's Grow Big.


P.S.- there's two plants, first one is the first and third pics, other is the middle pic.
 

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Looks like nute burn, and that it's overwatered.

Not positive on the nute burn, but def overwatered from the dropping.
 
The temp has actually been dropping over the last week or so, the room's dropped from an average of about 85-90( I know not good) to about 80. Would over watering kill the leaves like that?
 
The higher temperatures means higher humidity as humidity goes up as temperature does...... Over watering an already humid plant that cant transpire to the humid air makes plants look like that..... :)
 
ppm? ph? RH?
these is key info for proper diagnosis.
let it dry out, water, and repeat is sound advice and most common problem is over watering.
 
The higher temperatures means higher humidity as humidity goes up as temperature does...... Over watering an already humid plant that cant transpire to the humid air makes plants look like that..... :)


Relative humidity

From Wikipedia, the free encyclopedia

A hygrometer is a device used for measuring the humidity of air.


Relative humidity is a term used to describe the amount of water vapor in a mixture of air and water vapor. It is defined as the partial pressure of water vapor in the air-water mixture, given as a percentage of the saturated vapor pressure under those conditions. The relative humidity of air thus changes not only with respect to the absolute humidity (moisture content) but also temperature and pressure, upon which the saturated vapor pressure depends. Relative humidity is often used instead of absolute humidity in situations where the rate of water evaporation is important, as it takes into account the variation in saturated vapor pressure.

Definition

The relative humidity
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of an air-water mixture is defined as the ratio of the partial pressure of water vapor (H2O)
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in the mixture to the saturated vapor pressure of water
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at a prescribed temperature.
Relative humidity is normally expressed as a percentage and is calculated by using the following equation:[1]
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thanks wiki
 
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