OMG WTF?!?
 

So as per usual... I turn off all circulation and feed my corals.

Same routine. Power heads and return pump. No longer than usual. In fact about 20 mins top.

Then I turn around and my coral beauty is sitting facefirst in my candy cane. Six line curled around a rock not moving. Anthias acting weird.

Yellow tang is fine. Shrimp is fine ( which usually inverts are sensitive to issues ), coral beauty is now swimming again but six line is not.

OXYGEN?? WTF?? This has never happened before.

I tested water.

Ph - 8.0
NO3 - 0
NO2 - 0
NH4 - 0

Iron - 0

Salinity 1.024
Temp

I have yet to see my firefish, tailspot or neon.

Clowns look normal too.

Water is mixing. 20G change coming in about 10 minutes.

HELP. WTF is going on?

Weird! Any new food?

Frozen cyclopeeze.

But its not the first time I fed it.

As with any frozen food, I defrost in fridge and then use within about a week.

Never had any issues.

FUUUUUUDGE!

Stray voltage? Do you have ground probes in your tank? Maybe something happened to your power in the tank when you turned it back on, or disturbed some wires.

Just some thoughts. I recently found some stray voltage in one of my tanks due to a light fixture,... that didn't even touch the water.

What is the temperature? And do you have a lot of aeration when you have your pump running? what tank size and number/size of fish?

It could be that the oxygen level is already a bit low when the pumps are running so when you cut off the pump this low level of oxygen is depleated fast. I can't think of anything else. Ph is a little low if it was day time with light and aeration so that could be it.

Are they breathing fast?

Hmmm, I doubt you feed enough of that to bother anything if it was "bad". I'm not sold on the oxygen idea because I don't think your tank was off long enough. Did they start reacting while the tank was turned off or after you turned it back on?

Could it have something to do with an electrical leak? It is true 20 minutes is not long and I do it sometime for one hour to let my ricordeas eat and never see any bad effect on anything from turning off the circulation even for that long.

It is strange.

20 gallon water change complete.

Neon goby has come out. I am hoping it was an oxygen exchange issue. I cant understand it. It was almost instantly they changed though.....

Anyone happen to do any cleaning in the room with the tank? just a little polish or cleaner in the tank can cause big problems

I use a ground probe.

Temp 78.
PH is ok. It was tested early morning as light were just on. It will rise.
Not breathing fast at all.


I cannot remember... but I believe it was after I turned the pumps back on.

Sixline has now gone into hiding. No chance of recovering him if he dies.