Help fish dying

[JOKER]

Ok as says, my fish are dying. The fish were completely healthy, lost a coral beauty and a blue damsel today. Tested all water and everything is zero or near. Trace of nitrate, and phosphate, no ammonia. What else could it be? Only thing I can think of is adding a powerhead yesterday. added a Koralia 1150 yesterday and just aimed at the return just to get a little more flow. Left it on yesterday for about 8 hours. Noticed coral beauty dead last night and the damsel was breathing heavily. The hippo ,clown and pajama seem to be fine. I turned the powerhead off until I get the apex so I can alternate it. Could that have stressed the fish to the point of death?? I hate this has happened!!!! Could it be something I am not noticing? There is a chocolate chip star in there until I find him a home. 75 gallon standard running mag 18 splitting the return with the skimmer, most of flow is going to lifereef 36 skimmer. Running a wet dry filter with rock only for filter. 300 gallon per hour running in the wet dry to keep detribus stirred up. Now have the return really breaking the water line.

 

[krakatowa]

Do you run DSB? New power head could have stirred your sand

 

[Dowtish]

Sounds like a stray voltage.

 

[JOKER]

No deepest point would be maybe 2". Have 80 lbs in 75 gallon tank. Probaly 80lbs live rock in dt and 50 or so more in filter. Sand and rock were dry rock, only used like 4 live rock when started tank. The tank is fairly new but the parameters have been great. Monitored every day, saw a small spike like normal with cycling.

 

[JOKER]

Thinking from powerhead? Was brand new. Wouldn't I feel a stray voltage if had my hands in tank? Maybe I should change out the heaters. On of them is older one but the other is a new one. Have a brand new jager so I think I will change it out.

 

[lanaandjim]

I had a similar problem. It turned out to be stay voltage. I couldn't feel anything when I put my hands in the tank. When I checked with a meter, I had almost 50 volts. I unplugged one thing at a time and rechecked the voltage until I found the one causing the problem.

 

[gmoney243]

Did you vinegar bath the powerhead? Sometimes equipment can come with oils and toxins on them from factory that could possibly kill your fish.

 

[JOKER]

Did not vinegar bath!!! DOH. I rinsed well but didn't use vinegar. What a DUMB move!!!!!!! Never had a problem with that but that's only thing that was different and all fish were fine before putting power head in tank!! Thanks Mike for the wake up call!!! I never thought about that. Checked for stray voltage and don't think that is the problem. Will definitely be ordering ground probes for the tanks though just in case!!