Struggling with (some) acros

[vetteguy53081]

Well, guys and gals, I think I may have found the culprit. Due to everyone's input and suggestions, I decided to go over everything.

The one thing that I didn't do/hadn't done, was calibrate my salinity checker. Rookie move. I calibrated it this morning and my salinity is at 39.8. This whole time, I thought I was at 35.0 - 35.2.

That and the two days of high temps is what probably shocked/killed the acros.

Yup and was the first thing I mentioned this morning as it happened to me more than once

 

[Dburr1014]

Often an alk spike can cause burnt tips which then get covered with algae or when CA gets above 450 and nutrients are low or undetectible especially nitrates which are too low, while alkalinity is higher than about 7 dKH . The nutrient level in the water is the driving factor at what level alk can be kept at safely with acro. Low alk = low nutrients and High alk = High nutrients.

@Randy Holmes-Farley - Can you elaborate ?

Yes, if your nutrients are high you can certainly drive your alk higher. But with low nutrients, you wouldn't want to do that. You are basicly trying to grow coral fast with no food available = burnt tips = Skeleton with no flesh.
Your original statement said low alk will produce burnt tips and I don't believe that to be true.

This is a copy and paste;
"The concern is not the alk level but when alk is on the low end, it affects growth and produces burnt tips , ph swings and and can alter calcium levels."

I would like to see something to back this up. This is my first time seeing/hearing this.