Sweet spot?

[Authentic]

I have a 29 gal nano and have been dialing in my dosing for alkalinity and calcium.i had been dosing every day to keep my alk at 9.0 and calcium at 450. For the last 3 days my alkalinity has stayed steady and my calcium has only dropped to 335 .it is a reef dominated tank with only 3 fish.can you hot a sweet spot and keep things steady for longer periods without dosing?if so how long is possible?

[Randy Holmes-Farley]

There really isn't a way for calcium to drop and alkalinity not unless you are adding a ton of alkalinity supplement and no calcium, or did a huge water change with a very low calcium mix (but none are known to be that low).

I suspect a calcium test error, either for the 450 value or the 330 value (or both). :)