I use freeze dried krillTry frozen krill, it improves the red colouration drastically and it also has about 61% protein. Ocean free sells a canned krill which IMHO is the best krill.
I have also used okiko platinum, it shows improvement in color and kok within a week but I don't think it's healthy enough to be used as a staple diet. I just got cz aquas help for monster kok, if anyone has used it before share your experience