I can't access your picture but if you put some tank water in a white cup is the water green tinted? If so you have an algae bloom and no amount of WC
's or lower light will help. You have a couple options to get rid of it.
First you can try a 3 day black out. You have to literally cover your entire tank. Front, back, sides, top, and bottom as no light can be allowed to get in. And no peeking or you break the black out cycle. On day 4 uncover the tank and do a 50% WC
to remove the dead algae from the water. This may or may not work and the algae bloom can possibly come back if all the free floating algae is not killed.
The other option is getting a UV
sterilizer such as this one... Green Killing Machine Internal UV Sterilizer with Power Head at PETCO
. Algae will be killed off in about 24-48 hours unless you have a very bad bloom. This is the quickest and most effective way to kill off free floating algae that causes algae blooms.
After the algae bloom is gone you need to only run lights 6 to 8 hours daily and be sure to do a 50% WC
weekly to ensure nutrient levels are kept low in your tank.