Well, that’s a fair point but why are the consistent votes at 8.5-9.0?
Must be something magical about those numbers!
Funny, their is no magic in reefing, lol.
You can run your tank at any level you want as long as its stable.
When certain well known vendors preach numbers then the masses follow.
When they preach that the oceans alk is 8-9 people also follow.
Such is the nature of the beast.
Their are many misconceptions in the hobby.
I run alk of 7.2. If it goes to 7.5 no issues.
If if it goes to 6.5 no issues. I have been at both but maintain 7.2 95% of the time.
I hear this all the time at lfs.
They run 9-10. We get better growth at that range.
I get just as good of growth at 7 alk as they do with less issues.
Their is more to reefkeeping than alk.
Just strive to keep it within the range you decide on and you will have success.