Getting worried because some of them are starting to smell really sweet and orange zesty

and seeing them going yellow and ill is sad
anyway i did as all of you said which was to flush then feed! i flushed with about 5l of water a pot an then watered with nutes another 5l with .5ml grow and 1ml bloom. i also just lifted my light up a bit but will probably put down and just dim to 400watt for the next day or two i did this yesterday!
when i went to check today they were not as droopy and have perked up but the leaves to me are still yeloowing a it but we will see what happens in the next few days!
I hope this fixes them up! so in future to avoid this should u flush every 2-4 weeks?
thanks!
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