I would get rid of the crushed coral if it was my tank. I had a 35 gal
and pulled the CC out after 2 weeks. My LFS
still suggests CC and has it in all his tanks but from my research a sand bed is a better deal. I cant help in the CC and coral question as Ive always be FOWLR
. Most of what Ive read says an 8hr light schedule is good. I think you could run them more in a FOWLR
so long as you arent getting huge amounts of algae growing.. I think most people do run both the daylighting and actinics at the same times. Some very involved reef tanks use timers and bring the daylights on then switch on actinics later on, Im not sure why as I dont have a reef..