After putting the diffusers back on and shifting the rics to a shady spot, they don't seem to improve much. Still bleached, but at least not melting away. Imagine blue rics are now turquoise in colour! Quite pretty actually, but I think I'd still prefer blue any day. The yuma seems to expand a bit more, but hasn't regained its previous glory.
I have a huge contrast in zoa colours with regards to light, so it definitely plays a part in coral health. The zoas from the same colony had completely different shades of colour between the one placed in the shade and the other out in the open, both being on the sand bed. I'll post pics when I have time.
JBJ Nano Glo works pretty well. Cheato growth is amazing. I'm exploring the possibilities of using it with a scrubber. Stay tuned!