Are you using an ULNS or phosphate absorber?

I use a l Two little fishies reactor with ROWA Phos.


Here are the pictures, hope they can help.

http://i872.photobucket.com/albums/a...r/IMG_1964.jpg
http://i872.photobucket.com/albums/a...r/IMG_1965.jpg
http://i872.photobucket.com/albums/a...r/IMG_1959.jpg

Did you change your ROWAphos recently?

No i have not. I was going to this week tho

So today i think i have rtn, one of my otherr sps corals is loseing tissue. I also had flow on it and it blew more tissue off. Not sure what to do? Just frag it and see what happens??

andrew the only think that comes tom mind for me is we just got the doser going perhaps something related to that, nothing fell or stung those ones did they?

Now there's something... Did you have a kalk swing? Are you doing 2 part or 3 part? Is the RTN patchwork or receding from bottom up? Do you have any large snails or brittle stars the are acting a bit different or "lazy"?

What other changes have you made in the past few days?

From the pictures it looks like patch-work RTN, which to me suggests a rapid drop in nutrients (hence why I asked if you changed the ROWAPhos or are running ULNS) or a toxin. Kalk fluctuations can have the same effect sometimes but normally I see that as bottom up RTN or tip down in the case of high alk in an ULNS.

Also, are the affected colonies close together or spread out? How many colonies seem to be affected and what species?

Hmm I added the doser about a month or two ago and this only stated a week or so ago.. I checked my Alk last week and it was at 6-7. Cal was at 400-425 and Mag was 1200. I have been hand dosing a new bottle of Kent Mg...

I have not changed my ROWA phos for about 4 months.

On my stag horn acro the fresh is coming off the back side of the coal where not much flow gets too.. It really came off when I brought it out of the water and flow got to it.. looks like little specs all fell off.. Its about the middle.. not coming from the top, nor from the bottom.

I also checked my Phosphate today and it was 0.00PPM

They were not super close. No