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

[subman]

What type of corals? Depending on the corals you have and how many would dictate when and how often you feed. If you don't have enough corals to eat the reefroids they will just make a mess of your water quality.

The kalkwasser is used to increase calcium and alkalinity. So you add it as needed based on testing.

[Nano]

good point, I know my zoas/sopties and lps have responded well to it, not sure about sps yet as its fairly new to the system, like said above, to feed too much or too often, otherwise your water quality will go down hill. my dose that I use (1/8 tsp or so) is more like just a pinch