With regards to sump lighting. I have a dark period during the day for the reason of ph offset mentioned already but also for my pods
. Although I'm sure they are active in the lower levels of my cheato ball and rocks, I want them scurrying around the surface as well. That way they are more likely to get carried into the return section and when the lights come on (2 x 15 minute periods in the day plus on for good in the evening) they should make for the dark area that is my piping for the return pump (external).
Mandarin take-out. Or delivery.