What to do?

Bummer,  your little nano was really nice too.   When you say you dose dow flake..you mean it's dissolved in RO right?  Do you run carbon?  It might help.

 

I'm no expert but I don't see any glaring problem with what you've posted.  One thing that I might suggest is a phosphate reactor (I run both carbon and a phosban type mixture in mine.)   I really think it helps a lot.  I hope you get it figured out soon, it must be distressing to you. 
(Does anyone know why instead of the sad face icon I tried to use at the end of that sentence,  I get all that verbage on my posts???)

 

I agree with Robin, nothing you posted seems out of line. I don't think a couple of days evaporation would send your Salinity high enough to do this damage. So I think there must be something else we aren't seeing yet. Any chance of something getting in there like metals? How is the other livestock. What about Ammonia and Nitrites? Temperature or temp swings?? PH Swings?

 

Not that it'll be a cure but you might try a few 10 gallon water changes on consecutive days. Who knows there might be something that is affecting it that is untested too.

 

Along with the great advice already given above, I would start checking your equipment to make sure that everything is functioning properly. Check things like pumps, heaters and light bulbs. In a situation like this, I would also stop dosing everything for a few weeks until you can identify the cause.

Sorry to hear about your troubles, I hope you stick with it! /site/DesktopModules/NTForums/themes/_default/emoticons/smile.gif

 

Check your bulbs, I (and i think atticus) had a bulb go bad and radiate everything. It will still light up, just look a little funny.

Fish look ok?

 

Maybe there is a contaminant in the flake or purple up. I've always used the pickling lime because it's a food grade product.

 

What is your temp kept at?

 

What are you using for salt? Are you still using out of the bucket that I had left over?

 

Just curious as to that's kind of what was happening to my tank when I decided to tear it down.

 

One thing that might be happening too is you have a pump bleeding voltage. To test it get a cheap meter at radioshack (an analog one).
My tank in my basement had a bad pump for awhile and I never knew it even after putting hands in the water. One day I went downstairs with socks on got the floor wet and zapppp. You will not feel voltage bleeding most the time unless you are grounded somehow and complete a circuit. I'd recommend this for everyone after being lit up.

Another thing that could be happening is the change in salt. There was a good article somewhere about the top brands and what they consist of. Mixing a few of them together is not good due to the different percentages of chemicals in some them.

The zoos probably got taken out by the salinity increase some are kinda sensitive of it along with SPS. I always run my SG at around 1.024. I think only the GBR has a 1.026 SG. Most of the Ocean is lower.
Do you have any pics of the slime? Or, do you know what it is specifically. One slime that actually feeds off of the elements in the water. If that is the case water changes will hurt by actually feeding it.
Last but maybe most important is there anyone around you that would be willing to take your coral until it's under control? If you where closer I'd do it.

 

Get an analog one. One with a needle. I have a couple digital fluke meters at work and always finding myself using and trusting my crappy analog one when testing motors.

 

i would dose the tank with some chlorine/chloramine remover just to be sure.
ive heard of it happening a million times in freshwater setups.
municiple companies way overdose at times and you have no idea of it.