Name: Gina Florida (Zone 9a) Tropical plant collector 40 years
It looks like tissue burn. When plants are exposed to light from a very close source like a grow light, if droplets of water are left on the leaves sometimes the light will 'cook' the water, and hence, the plant. Are you using lights, or is there light shining through glass onto the leaves?
Award winning beaded art at ceinwin.deviantart.com!