What ranges are considered stable for key parameters?

[Mike from Penna]

I'm hoping to get some feedback on the tolerance of the following parameters that are deemed acceptable/stable. I know everyones target will differ but can someone please fill in the "??" below?

For example my alkalinity varies +/- 0.04ish. Would you consider that range stable or needs some work?

Alkalinty: target +/- ??
Magnesium: target +/- ??
Calcium; target +/- ??
Phosphates: target +/- ??

Thank you.

 

[bluemon]

here is what I look for in terms of optimal parameters from the GOAT:

https://www.reef2reef.com/threads/o...-reef-aquarium-by-randy-holmes-farley.173563/
And stability is not really referring to its deviation from the optimal parameter.

Its changes from time to time in your reef for your parameter.

An ALK swing from 8 to 9 to 8 to 9 daily is worse than a system with an ALK of 11 that does not change daily

 

[CHSUB]

I have been in the hobby since 1980, had multiple sized tanks for long periods, and worked at a LFS. Imo belief that someone has an idea of what stability is based on hobby testing seems questionable. For example: observation of corals paling because of a drop in po4 from .1 to .02 when in reality po4 was stable and the drop is within the error range of a Hanna Checker.