Plants are starting to get worse!

Hi guys, can anyone help me with my plant problem? She is slowly getting worse, what should I do. I have a hydro set up with tank, pump, air pump, and drip nozzle with a three time a day feeding in rockwool once in the dark and twice in the light. Not sure what kind of grow light I have, but it's a good one! It's like the sun is in my closet! The light is 18" from the tips. Let me know if you need more info! Thanks!

potassium deficiency

also check heat stress and spider mites

Check your nutrient levels it looks like you may have too much or too little nutrients. Nitrogen may be the cause; either too much or too little. Also you should adjust the level of your light...18'' may be too close... Possible heat stress; you should allow at least 2-3 feet from the tips of your plants.

I also agree check for spider mites, your temp of the room, humidity etc.

Hope that helps.

Thanks guys, I'll post the results!