All 50 or so in my 20 long died at some point in the last couple of hours.
They were in a large pile in the center of the tank when I got home, was gone for ~5 hours, and they were all fine and active before. Some of them are still twitching right now, but most look like they're already gone.
Parameters are perfect, too. pH is 7.4, no ammonia or nitrite, nitrate is 40ppm (time for a water change). The seven otos and two farlowellas in the tank are all swimming around like nothing happened.
All water used is RO, original fill, topups, and changes. Just changed 5g immediately after taking a sample for testing, it's all I had left of it, though I doubt it will do any good now. :/
Only thing that changed recently was adding a piece of driftwood last night and attaching some peacock moss to it with superglue (cyanoacrylate, totally aquarium safe). Last water change was last weekend, 6g I think.
Ugh, I feel so bad for them. I'm helpless for the ones that are still alive, other than doing water changes.
I didn't get a picture of the pile of them (too frantically grabbing a sample and changing as much water as I could), but here is the current situation as of 12AM.
The driftwood in question.
The otos are all fine. :/
I'm so disappointed. This has been my favorite tank so far, the shrimp were so active and so fun to watch, and now they're all dead or slowly dying, and I can't do a damn thing about it. :icon_cry: