How/when do I feed reef roids and suppliments??

[bluesox68]

Hi guys this is my first tank with a sump/fuge/skimmer and I own reef roids, kent kalkwasser mix and ZoPlan diet. I am wondering how often to add these and do I do it at night and do I have to turn the skimmer off? Any advice would be great. My tank doesn't have a ton of corals but my MH isnt firing up so "maybe ballast?'' so the only lighting for now is vho. Thanks