I agree w/ Lando. Claiming to eliminate the need for
PWC's is going a little too far. I realize replacing trace elements, etc. is not as important in
FO tanks as it is in reefs, but it's still good husbandry
IMO. Even more so in
FOWLR for the hitchhikers (inverts, coralline).
Alk levels will diminish w/ time as it's used to neutralize waste(acids) to maintain PH.
PWC's are good for replenishing
Alk,
Ca, etc.
PWC's are just a part of good husbandry
IMO and IME.