When your new test kit arrived, was it the same brand? Wondering if you were getting a bad reading from your old kit? Seems like it fell way too fast to me.
Yes, I only use Salifret.
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When your new test kit arrived, was it the same brand? Wondering if you were getting a bad reading from your old kit? Seems like it fell way too fast to me.
I would think high phosphates would cause the whole coral to brown, not just the tips. Are you skimming? I'm also not familiar with the salifert phosphate test, how low does it read?
Any chance you could have someone else local or a LFS to do a full range if tests to verify your numbers?
You had an alk swing, that's all.................I'd quit changing things. Run the tank the same you have always ran it when the corals looked fine before the swing. You are making too many changes right now & stressing things out.
Everytime you do something new or different the corals have to adjust. Think in terms of months when you make a change.
If things are stable it will take the acros 6-8 weeks to color up again & look good.
I think the Alk swing got the ball rolling down hill, even new corals are browning out so I know something is amiss.
Today all my LPS look great, haven't looked this good in awhile, so hopefully the SPS will follow suite.
Glad to hear things are doing better for you now....hopefully the trend continues. is it a new batch of salt? maybe you got a bad batch...who knows just as long as things are looking better.....also could have been some of the LPS going to war.

