Chaeto Withering Away

[secure1347]

Was wondering if anyone could give me some suggestions as to why my Chaeto is suddenly dying and withering away. Here's the specs and what happened:

150gal display, 55 gallon sump (~10 gallon refugium)
Refugium Light: 90W Equivalent (5000K) PAR38 LED
Ca: 400-420
Alk: ~9.5
Salinity: 1.025
Phosphates: 0.08 ppm
Nitrates: ~6 ppm

I got the Chaeto about month ago and had it on a 24/7 light cycle and it was doing awesome. Grew about 3-4 times it's original size in a couple of weeks. It wasn’t always tumbling because it often gets caught in the rocks at the bottom of the fuge, but seemed to be doing well. At the time my phosphates were up to about 0.36 ppm so that’s why I added it to the fuge and I also started running my GFO a little over a week ago. I also did a couple of 50 gallon water changes over a week period (about 1.5 weeks ago) to get my phosphates down and I started seeing cyano in my sump and some spots in my display. I sucked out all the cyano I could from both. After the last water change the phosphates went down to 0.08, but my nitrates didn't drop significantly from what I saw. I noticed some of the cyano getting on the ball of chaeto so I pulled off the pieces I saw. Over the last few days the ball has decreased a lot and it’s starting to get brown and appears to be dying.

Is this from lack of nutrients, cyano, lack of tumbling…..? Any help would be appreciated. I will post some pics.

 

[CButkos]

Following along, having a very similar issue as well.

 

[secure1347]

Anyone ? I forgot to mention that I change from a 24 7 cycle to a reverse cycle because I thought that might also help the cyano from growing too much.

 

[Reeflife916]

Anyone ? I forgot to mention that I change from a 24 7 cycle to a reverse cycle because I thought that might also help the cyano from growing too much.

I once had problems with chaeto slowly during as well. I found out that I had a combination of my cf lighting too close and the ball not properly tumbling.once I backed the light off and trimmed it up, it grew like crazy. But I had to keep up on trimming so that it would tumble

 

[secure1347]

Hmmm I wonder if that could be. I assumed with my 90 watt LED that it wouldn't be too much light to put it right on top of my 55 gallon tank where the refugium. It started out for the first two to three weeks doing so well so I'm wondering if that really would be it or not.

 

[secure1347]

Well my chaeto finally disengrated to almost nothing and I threw the last little bit away. Could my lighting really be too much ??