I think running carbon is fine but whether running carbon will increase par enough to get them to stop stretching remains to be seen. If you do attempt to run carbon heed Marks advice and do it very slow as the clarity it'll create can and will burn the corals if to much carbon is used. I know, I've done it. I don't run carbon myself because I don't have room for a reactor but if I did have the room I probably would but mines doing well without it. If you do want to try higher par is your Radion hung in such a way that you can lower the light an inch or two instead of moving coral or changing light program? I am of the opinion that corals will adapt to good lighting whether it's more blue or more yellow in color or higher and not as high par and the more you mess with lighting the more you mess with the corals. They want stability. My opinion is still I'm not seeing what I would consider a "problem"
