The RO water mixed with Kalkwasser is BAD since it reacts quickly with air to precipitate the calcium out of the solution, and pumping in the precipitate is A Bad Thing.
So I put a Tunze Calcium Dispenser in the RO bucket. Basically the RO water is pumped through the dispenser to the sump. Inside the closed dispenser is the kalkwasser mix.
Added 10ml Combisan and will try to add this on a weekly basis.
The shrimp and crabs and snails are doing fine. The Colt Coral is unhappy since all its polyps are retracted. I moved him with underwater epoxy to be on top of a rock in the water stream, and closer to the light.