Can you post a pic of the whole plant please? It'll help with further diagnosis. what's your run off ph? for soil you want to keep your PH 6.3 - 6.8 with 6.5 being optimum. IMO It looks like it could be build up in the soil. It's not good to nute them with every water. a good watering schedule is water, water, nute, water, water, nute. Is the soil dry every two days and that's why you're watering so often? When watering, you want to give them enough water that you get some run off. Wait until the soil dries at least 1" below the surface before watering again. I'm not familiar with the nutes that you're using...hopefully someone who is will chime in. Good luck! Doin'