It's not always about supplements, it's about lighting as well. In my old aquascape, I had my shades of the fall up high and in about 500 PAR and the colors were decent, but after my aquascape, I moved it to an area with about 200 PAR and it's the best colors I've ever seen from it. Same with a tort I have. I had it in high light and the colors were good but I thought it liked low light so I put it low in the tank and color went downhill.