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everything normal except ammonia, putting that down to deaths
Its not going to drive me out of the hobby, just feel totally deflated at the moment.Yea I would agree, even at .3 it probably wouldn't have caused a widespread death like that. Only thing that makes sense is something got introduced to the tank, someone spilled something etc. God that really really sucks man. I know its probably hard to hear, but keep your head up, don't let it drive you out of the hobby!
all was normal yesterday and no inverts added recently, last fish was added about 2 months ago iirc.I’m so so sorry for your loss.
have you added any inverts recently? When was the last lime you added anything (fish, invert, coral)?
did any of you fish act weird at all yesterday?
The only possible reason I can think of is some sort of substance getting into the tank, I guess I will never know what or how.Any inverts (shrimp, crab, snail, worm, seastar, urchin,...) in the tank?
If yes, how are they doing?
What you describe so far sounds like some potent but rather selective poison like Rotenone got into the tank.
See also:
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Rotenone - Wikipedia
en.wikipedia.org
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An Assessment of the Effect of Rotenone on Selected Non-Target Aquatic Fauna
Rotenone, a naturally occurring ketone, is widely employed for the management of invasive fish species. The use of rotenone poses serious challenges to conservation practitioners due to its impacts on non-target organisms including amphibians and macroinvertebrates. ...www.ncbi.nlm.nih.gov
I had a 20-year-old pair of ocellaris and an over 10-year-old pair of marine bettas cooked by a stuck heater. One of the marine bettas was one I bred myself.Its not going to drive me out of the hobby, just feel totally deflated at the moment.
Like you say its hard enough to lose fish but fish that have a special significance is hard to take.I had a 20-year-old pair of ocellaris and an over 10-year-old pair of marine bettas cooked by a stuck heater. One of the marine bettas was one I bred myself.
Losing fish you have a history with is gutwrenching.
I check my salinity with a Hanna, milwaulkee, and refractometer.Have you considered an ICP test to look for metals or other unusual concentrations of elements?
Also may want to check the calibration on the salinity reader. My refractometer once showed 1.026 But it was really 1.030 since I had not calibrated in over a year
Metals may kill one or two fish but not likely all and not all at once. And with toxic metals corals would go down long before the fish.Have you considered an ICP test to look for metals or other unusual concentrations of elements?
Also may want to check the calibration on the salinity reader. My refractometer once showed 1.026 But it was really 1.030 since I had not calibrated in over a year
If aerosols or other foreign liquid was added a sudden spike could devastate a tank. Just a suggestion to get a full water test done.Metals may kill one or two fish but not likely all and not all at once. And with toxic metals corals would go down long before the fish.
As for salinity, fish can handle salinity swings and drifts quite well. I had tanks drifting up as high as 1.040 and none of the fish in the tank looked like it would bother them much.
I also had tanks intentionally at 1.016 and the fish did even better than at nominal.
And an LFS here had forgotten to turn off the RO refill of their SPS coral system over the weekend. They caught it a day later when the water in the tank was pretty much freshwater. Not one single of the fish they had in there died from the freshwater or the following ramp-up, but all the corals and inverts where toast.
Fish are not likely to die due to salinity being off.
I will send one off, like you say it may or may not show something.If aerosols or other foreign liquid was added a sudden spike could devastate a tank. Just a suggestion to get a full water test done.
A camera will definitely be on my shopping list when I start it up again.That's truly awful. I have a camera pointed at my tank at all times in the event of an issue like this (and to remotely monitor if the need arises). I look at it like cheap insurance. The event that happened to you is bad enough, not knowing what happened makes it worse...You'll be constantly worried when you start over again.

