should calcium drop daily?

72 gallon w/ 25 gallon sump.

3 frogspawn
1 candy cane
all softball sized

numerous shrooms, zoas, palys.....

just got some sps.

No clams and ph is stable. Could it be from just topping off tank and not doing monthly water changes?
 
Well i know ppl that never do water changes and their cal/alk lvls stay fine. But ive never had luck like that.
 
I don't know anybody that can maintain CA/Alk without either doing water changes or by dosing. CA will feed even coraline algae so it will get depleted regardless of whether or not you have stony corals in your tank. Your frogspawn and candy cane corals are going to use up CA.
 
Mr Porpoise is right in my opinion. Need to replace the water more frequently. I think it is better for the health of the tank than any supplement. You remove pollution and replace alk an ca plus all those trace elements.I spend my money on salt and dont use supplements. Better stability also I think.
 
I would (and do) change 20% of my tank volume on a weekly basis unless I'm dosing something in particular that needs more time to work. An example would be dosing TechM. That's a 2 week regime then I change 20% Even doing that may not get your CA/Alk to where it should be but it would be a good starting point.
 
if your corals are growing daily, then your calcium will drop daily.. I'm sure that they all grow at different cycles (that sometimes align)..

but bottom line.. I'd be much more concerned if your calcium dropped a hundred points in a week, than if it dropped gradually over a month..

more water changes definitely seem to be in order here, though..
 
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