Im using a combination of HPS, Metal Halide, and tube flourescents...
Anyway, I am having trouble with one of my 4 plants. The whole plant is a yellowing\greenish\goldish color??? This plant is in a 5 gallon bucket, and I did use the FIM TOPPING Technique (which produced 4 new shoots)... its been fed peters 20-20-20 during VEG. and 2 doses of 1/2 strength nutes during Flowering..
Anyway, I think the problem is compacted or poor draining soil.. I used a mix of 1/4 perlite to soil. the soil does dry out though.. just takes longer than the others....
but if anyone has any ideas it would be greatly appreciated!!!!!

My other plants are a nice dark lushious green.. same treatment except the 5 gallon bucket. Here are some pics (cant really see how yellow it is compared to others)

Just let it dry out, you'll probably lose those really yellow leaves but it won't really hurt a thing. Sure looks over watered to me