deficiency, excess or disease?

Excess of nitrogen, lack of P/K, Mg maybe if you don't add extra on top of base feed. And a high ec, burning of tips is the symptom of that. Should be fatten up if you correct it, good luck!

Hello you have a calmag deficience and little overfeedind. Use epsom salt to correct your calmag deficience and give them reduced dose of nutrients. For epsom salt you can mix it in water and mist your plant for rapid absorption or you can water your plant with it or put it directly in the soil . it is up to you. Good luck.