Overwatering or underwatering

Got a nuken seedling in the midst of wilting. It's on it's third week, currently feeding it R/O water at ppm between 150-200 at pH between 5.5 - 6. I water basically every time it gets dry, so about once every day or so, focusing on not feeding too much or too little. It's in the tray under a 19 W LED, about 6" inches from the light. The initial first set of leaves suffered heat stress, but it kept going strong and continued to veg. The wilting started yesterday, after feeding it went away, however it came back. I also tried to let the rockwool dry out a considerate amount today to let the roots get oxygen, however it didn't seem to help the wilting so I ended up feeding it again lol.


Any help would be appreciated, was wondering if it could maybe be unrelated to watering even.
 

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