I'm looking into combining two operations on my marine reef: Limewater (kalk) FW top-off, and non-live phyto/rotifer feeding to the corals. Does anyone know if putting this food into 12+ pH of limewater will damage it?
Since it is dead, that's a non issue, however, some nutrients may be leached out due to the high pH of the Kalk water. Some proteins, vitamins and surly the chelated traces etc will be unchelated at those pH's.
I'd keep them separate in solution/reservoir and use a single pump line/pump from there. Once well diluted in the tank, sump etc, this will not play much role.
A similar issue exist with PO4 and Fe dosing in FW systems, in the PO4 likes to precipitate out as FePO4 at high concentrations in bottles reservoir etc. But it's fine in the tank.