Losing fish

[kelipalmer]

I did a routine 10% change tonight and within a few minutes of completion, had a chromis die and a blue devil disappear. Now about an hour later our yellow tang is about dead also. Checked all the usual chemical levels and nothing is wrong. I also changed a filter sock and scraped some algae off of the back wall. Any ideas?
100 gal reef tank.

 

[pmcarbrey]

check the tds of your rodi output, and what are the "usual chemical levels"? we can't help if we dont know the test results

 

[snorvich]

Sounds like a contaminant of some sort. However more information would help. Tank size, readings, etc. Saying everything is "normal" tells us nothing.

 

[kelipalmer]

Tds = 0 at the rodi, ammonia = 0, nitrite = 0, nitrate = < 5, dkh = 7, ca = 400, phos =0.
Ended up losing the tang about 2 hours after the water change. Apex didn't report anything odd during the change (no big temp change or ph spike). I double-checked the salinity to make sure it matched the tank. All other livestock appear healthy as of this morning (clown, conch, crabs, banded shrimp).

 

[kelipalmer]

Losing fish

Levels are Ammonia = 0, nitrite = 0, nitrate < 5, dkh =7, ca =420, phos = 0 and Tds at the rodi =0

 

[thax]

What do you keep your water in? Does it have a lid?

 

[kelipalmer]

Brute trash can with lid.

 

[biomek]

you mentioned you had changed the filter sock. Could the new sock possibly have some sort of contaminate on it ? Had it been cleaned prior to putting in the DT? If so, with what?

 

[kelipalmer]

Could have been the sock. It was a used sock that had been cleaned with hot water only.

 

[kelipalmer]

Just got home from work and my blue devil is out and looks healthy. He disappeared during the water change last night and I assumed he died like the other two.