plant keeps getting worse and worse.dont know what to do:(

This plant has grown very slowly from day one. It's always been wide and thick but short. And I have topped all my other plants at the same time and this one is barely barely producing new growth. And now the leaves are getting lighter shades of green and shriveling up. Any advice?

what kind of lights have they been under?

Are you a "Heavy Feeder"?
Is that a White Widow?

Under t5 lights and no I don't over feed and not white widow.

so the rest are doing good and have recieved identical treatment?(other than the topping them)have you Checked your soil ph on that one lately?

i agree with dark, check ph if it is to high or to low this could be causing lockouts stoping certain nutrients been take up by the roots

Ph is at a steady 7