Plant deficiency help

[soccergrow]

Plant is auto northern light
Its 4 weeks from sprouting
Looks to of just started to hit flowering stage
It's in dwc
Light is mars hydro 1000w reflector led
Tent is a 4x4x7
Temp is 65-86f from light on to light off
Light schedule 20/4
Rez temps is 73f
Ph 5.2-63
Nutes fox farms at 1/4 strength and cal mag same strength
Hydro guard 2ml per gal
Z7 both parts .5ml per gal
Useing distilled water
Ppm is 140

Plant has brown spots thinking cal mag deficiency but not sure any help would help greatly

 

[Chris Scorpio]

Looks like calmag issues, but what's the white spots all over it??

 

[soccergrow]

It's from my hard tap water that's in the hymdifer in tent. Waiting to get an ro water system shipped and will use ro on it as well. Currently useing distilled for the rez

 

[Chris Scorpio]

Distilled isn't very good to use

Get that RO water soon, that could be yer issues