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Bill Nye
08/14/2017, 06:24 AM
Last night I was doing a water change and I noticed one of my newer acros started to RTN from the base. The coral in question was added about 2 or 3 weeks ago and never really seemed to get comfortable. While the other acros I bought at the same time had all started encrusting, this one did not. That being said it always had PE and even had PE while the RTN was happening.

Anyway, I'm wondering why just one coral would RTN? All the other corals look normal with really good PE. The funny thing is that my other corals are looking better than ever with increasing polyp extension. Is it because it never acclimated to the new tank conditions? This week I purchased all new RO membrane and filter for my RODI but I did all the necessary maintenance such as running the membrane for 2 hours before collecting water.

Here are my parameters

Salinity: 1.025
Nitrates: 0
Phosphates: 0.003
Kh: 7.4-7.6
Calc: 420

mpsteve
08/14/2017, 11:51 AM
You have almost no nutrients. Try raising nitrates. I have the same issue and I think that's why my corals never have the best color. My algae scrubber keeps my po4 at .03 which is fine but I can't get my nitrates up. Always is 0


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Bill Nye
08/14/2017, 12:15 PM
Thank you for the reply.

I have been dosing some of the nutrients from AF to try to raise my nitrate but so far no luck. I am going to be dosing twice as much Coral Food (planktonic freeze dried food) this week to see if I can get some measurable nitrate.

jda
08/14/2017, 05:17 PM
Don't sweat one coral RTN - this happens to everybody and especially with some new additions. It can just happen. I would do nothing differently unless you see a few more follow suit - you can jack more up by "fixing" stuff than if you just leave it alone.

You don't have zero nitrate - impossible. bit I also know that test kits for nitrate are not easy. Just leave it be... there is enough N in there to feed the coral. Those are NSW parameters and the acros do well in the ocean.