yellow spots, curling leaves, tips yellowing

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can you help with this please, any pointers

I have this problem with one of my plants...any ideas??? anyone?

would say maybe too much/not enough water.... but ive never tried hydro before

Ok, without having clear pics its kinda hard. That said, with what I can see, it appears you have some sort of nute burn. Usually leaf tips curling one way or another is indicative of a problem with your fluids. Nut's to hi in the ppm range, ph not adjusted properly for the hydroton? How about you tell me everything, ie, lights your using, nutrients your using, your distance from the light to canopy top, heat temps in the area the plant is in, ventilation, etc. Give me everything you got and it'll be way easier to help you.