Yup you absolutely need some nutrients in there.
PLUS, looks like you got a small case of Spider Mites starting to do some small leaf damage. Better get on that before it gets bad.
Neem Oil with 2 - 4 teaspoons per gal + wetting agent every other day.
And if you have any danger of Powder Mold in your area use the following:
Spray with ph 8.5 water + wetting agent on the days between the Neem Oil sprays.
If you don't have any Powder Mold danger, you can use regular tap water + wetting agent on the days between the Neem Oil sprays.
This will help get rid of your mites, and prevent a lot of other bugs as well as PM. This will also make your plants super happy as they love to be foliar sprayed.