When you were chasing around all the guppies, did you disturb the substrate a lot?
Yeah, it was unavoidable, but I did change water afterwards, I will try another water change and vacuuming substrate when I will find some time.
If it is stress, minimize it by keeping lights off, provide more hiding areas, and maybe even limit your presence too them until they settle down (though you do need to inspect them every so often for any possible disease progression.
The tank is in the garage so I do not go there that often, feed them twice a day and occasional comings and goings by the car. It is heavily planted (e.g. the plants are out of control ;-)) so they do have ton of hiding space.
Stressed fish have a compromised immune system, so they do become more susceptible to disease they were previously unaffected by.
Thats what I suspect.
How long have you had the neons?
The tank was started in summer 2015. Neons dropped in soon afterwards, so about half a year. Initially a bunch of them died because it was super hot and I had to buy a chiller for the tank. Then things were awesome until one day I bought two guppy females for my 3G tank on my desk at work.
You some kind of surgeon or something? I've yet to dissect a fish myself (besides fish meant for consumption)
LOL, no, but cutting little dead Neon with Xacto blade is much easier and less mess than cleaning guts of a big fish you caught in the lake (I used to fish as a kid, and my dad was like: you caught it, you clean it).
water params (api test strips)
GH (ppm) 30
KH (ppm) 40
NO2 (ppm) 0
NO3 (ppm) 20
Temp: 26 deg C (controlled with heater and chiller)
Damn, lost 2 more today. One is too rotten to tell. The other, even dead looks like model from Neon Tetra Swimsuit Magazine, no external signs of any disease. WTH?
I dosed with ParaGuard today and tried to install UV sterilized but it is of course little bit too tall to fit in my tank.
Few more days and the problem will solve itself. There will be no Neons left.
So does anyone SF Bay Area want free Super UP-23 13 UV sterilizer in? Just come and pick it up.