Any remedies for this issue?

Only getting this on one plant

Need more info details....

Speed+ auto in soil under 200w led humidity 45 temp 22c about 4 or 5 weeks from seed

Ph/Ppm run off?

No idea of ppm mate but ph about 6.5

ill be willing to bet your out of range. Thats usually where the problems start.

Ok mate will double check cheers