That's good that a change in diet has help with his problem. Being full all the time probably stressed him out, and cause him to shed his intestinal lining, hence the clear poo.
I would get him New Life Spectrum Algaemax as his long term veggie alternative once you are out of Hikari algae wafers or Northfin Veggie pellets. The AlgaeMax has many aquatic veggies like 3 kinds of seaweed, kelp, and spirulina. They come in 2mm pellets and wafers. The diet would alternate between regular pellet and veggie pellet every other day, so it would be like regular pellet Mon, Algaemax Wed, regular pellet Fri, etc.
I would get him New Life Spectrum Algaemax as his long term veggie alternative once you are out of Hikari algae wafers or Northfin Veggie pellets. The AlgaeMax has many aquatic veggies like 3 kinds of seaweed, kelp, and spirulina. They come in 2mm pellets and wafers. The diet would alternate between regular pellet and veggie pellet every other day, so it would be like regular pellet Mon, Algaemax Wed, regular pellet Fri, etc.