NEWBY - Leaves Curling - PLEASE HELP

[HydroFarmer72]

Newby Hydro Needs Help

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Hopefully someone can help me on this. I am new to this and using a simple hydro set-up. Temps have been 75-80 degrees, humidity around 55%. I am using multi-spectrum Fluros for lighting.

My tips are starting to curl upwards and turn brown. I noticed that there are slightly lighter green/yellow spots on the leaves. I thought this was a nutrient deficiency yesterday, so I added a half dose of micro and grow. Problem is still prevelant today...possibly worse. PH has been 5.5 - 5.7 consistently.

I have researched the problem extensively on these forums and nutrient deficiency seems like it resembles nutirent burn.
This is 16 days into a grow on Northern Lights.

Any suggestions??? Pics attached( I origninally posted on the NEWBY section, so I am not sure if it is allowing the photos to come up here. Please see the Beginners section for the photos if they don't post)

Any help would be greatly appreciated. My grow has been very good up until now. I don't want to damage the plants any more than they already are. Thanks in advance!!

[nikidog11]

I had a similar problem recently, I fixed it with some Epsom Salts, (magnesium deficiency) Its either 1 tsp or 1 tbs per gallon it says how much on the package, you can get it at any pharmacy or wally world and I sprayed the leaves with the solution also, the plants rebounded in 2 days.

I hesitate to give advice, Ive only been growin for 5 years in hydro, so I am no pro

Good luck,