Quote:
Originally Posted by Aquattro
ULNS systems typically do best with a lower dkh, around 7. However, mine has been above 10 for months running zeo with no ill effects. Not a really important value, other than stability. If yours is 11 and stays there, you shouldn't have a problem. A noted issue with high alk and ULNS is tips burning, but that doesn't sound like the issue you're having.
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This is more what I was getting at before. whether you are intentionally ULNS or not, high alk with low nutrients can cause tip burn in acros and I have found it to cause birdsnests to die from the inside out. So if you're doing a good job at keeping nutreints low, well then alk might be an instigator of this.