Hi Jason,

thanks for the thoughts. The frags were purchased at J&L, they were in their SPS tanks which I believe are illuminated with 400w (not sure if they have one bulb per tank or two). That is why I originally mounted it so high up in the system since I only have 250w bulbs.

I have not measured TDS as I do not have a meter. I think it's time that I get one though, I think I saw a special at J&L's. I wonder if it's also time to change the filters in my RO/DI, one of them is starting to get a slight yellow tinge to it.

Can you tell me what RTN stands for?

Thanks

Rob

RTN stands for "rapid tissue necrosis" which is something that can happen to an SPS frag. Some SPS corals like Acropora can just shed all of their tissue, from the base to the tip. Happens in a couple of hours or so.

That definitely sounds like what happened, when it seemed like the flesh had turned gray and my wife turkey basted, it just came right off :cry:

I am trying to reach J&L to order a TDS and maybe a refractometer. My Hydrometer is over a year old so maybe it's time to get a new one!

Best,

Rob

TDS Meter ordered, new PH test (Salifert as well). I guess we'll see what happens with the other frags.

Rob

Any reason in particular for RTN to happen? Water quality?

Rob

Whole pile of reasons why it could happen. Poor water quality, different lighting conditions, allopathy from other corals near by, temperature swings, too hot/too cold, etc.

Gotcha, too many reasons to count!

TDS Meter came in today so I'll check my RO/DI when I get home. I guess that I should check both the reservoir since it's outside, and then fresh from the output to see if there are any contaminants.

Do people check their freshly made salt water or is that not needed?

Rob

No, you don't check your saltwater for TDS. You test for purity of your top-off water or water source... hoping for a low number.

Thanks guys,

So my Reservoir water is at 12ppm and my output from RO/DI is at 5ppm. The filters and unit were bought new in December, so I guess that it's time to order new ones. Do you think that this could be part of my problem?

Rob