Considering the dilution factor you will be using, there shouldn't be any problem dissolving the PMDD. You can set this pump up as your daily top off, making up for any water lost to evaporation. I think reef keepers do something similar with kalkwater, however that is spelled.
Aquascape? I'm a crypt farmer.
It's a fine line between fishing and standing on the shore looking like an idiot.
That IS an aquascape, it's titled "The Vacant Lot".