Leafy green fish food

I need a recommendation for a leafy green fish food for my pair of clownfish. I have been feeding them Ocean Nutrition Formula 1(pellet), Ocean Nutrition Formula 2(frozen), and Mysis Shrimp. My clownfish's feces is stringy and white yet my purple firefish is normal. I read online this might be a bacteria infection, but my purple firefish is normal and clownfish seem to be normal actively eating+swimming). I also read this might be because my clownfish's diet contains a lot of protein which is causing the problem. I need a recommendation for a Leafy Green fish food as my current fish food contains a lot of protein. Thank you! ;D

 

If you can get Rod's Food, you should try it. Tons of veggies and marine algae in it.

 

Any alternative that a LFS will have on hand since it seems like I have to order online for Rod's Food?

 

Problem most likely isn't foodwise but is most likely internal parasites causing the stringy white feces.