They look like they would just fine with 1/2 a teaspoon of nutes per gallon. Also try to change the nutrients every 10-14 days. Going any longer can run the risk of imbalanced nutrient levels, causing deficiencies and lockouts.

From the pic I notice a huge light leak from where the water is making the container bulge out. Try to squeeze in the sides and secure the lid on tight. If you can't then you'll need to block the light from getting in with something.

Also, the container itself should be light proof. Try covering the entire outside of it with a couple layers of duct tape, thick sheets of black plastic, or whatever you might have available to make sure that no light will shine through the top and sides of the container.

Because of the light leaks it's quite possible you have bad bacteria/algae growing in the res, maybe even some root rot. If you can manage to do it quick enough, during a change of nutrients try to clean out the container using hydrogen peroxide - H2O2. Then once you've filled it up with a fresh mix, also add 1-2 teaspoons of 3% H2O2 per gallon.

I hope some of my rambling can help ya out. Good luck!
GreenDestiny Reviewed by GreenDestiny on . question? i started my plants more than a month ago but have had lots of trouble almost every new set of leaves eventually turns yellow and dies once they get to a mature size some of them turn yellow with little black dots. the plants are growing at a moderate rate and have alot of branches. but i cant get my leave to stay green. could it be that im keeping my 400 watt hps to close (little less than a foot) at first i was putting in too much nuits but now im not sure if im not putting in enough. the Rating: 5