Maintaining NSW levels are fine for a fish only tank and will aid in stability of PH, alkalinity and magnesium, which keeps fish healthy. Calcium depletion is only a concern when you have coral and inverts. I use Pickling lime (calcium hydroxide) in my ATO top off to supplement my calcium.
Using the following calculator: http://reef.diesyst.com/chemcalc/chemcalc.html
__________________
Don
Reefing since 1993
Current Tank info: 125 gallon DT , 125 gallon basement sump. Rw 15 & Rw 8. Panworld 150ps return. Reef Octopus 150 skimmer, 3 165w mars aqua led.
|