Well after a few years finally had a bad crash of my 40b.
Currently didn't lose all the fish but some of the older and weaker ones (long story).
Was leaving for work and went to feed the fish (tank was perfect last night and even took some photos)
and there were floaters.
Nitrite was 2ppm.. Highest I've ever had.
Ammonia was up as well but since pH is low (<7) wasn't too worried..
Dosed an emergency amount of Seachem Prime. Didn't have time for a massive water change but did pull and replace 15%
Sadly lost my old Chinese Algea eater, a black neon and a red eyed tetra.
I had recently introduced some small Platys from the over flow of them in the 55. not all accounted for nor all of 5 zebras though 4 were there.
Large Pleco I'm "house sitting" was fine. MM platy was fine so far.
I'll miss the golden algae eater the most.. my oldest fish since I re-started..
Acquired it from an estate and it was bone white due to the tank coloration. Was lemony gold for me after acclimating ..
Only change between yesterday and this am is last night I did dose some Met14 but the quantity was way below what most would consider "problematic" 45mL..
Sadly, it probably could have been prevented. Oddly enough last night I heard a few "splashes but assumed the Buenos Aires Tetras were being a bit frisky.
Once it even sounded like one hit the glass. THAT was unusual.
Never checked on it..
Will followup since I, sadly , needed to work and won't be back for hours.
Not sure what spiked it so badly but may need to rethink the Met14 though this has been a "one of" in using it for years..
Filter inlet was mildly restricted w/ moss (stuff is annoying) but flow seemed normal-ish considering..
Can stop at home for lunch and, hopefully, all is re-stabilizing.
Thankful for having Prime handy. Consider it a "must" for everyone.
all told though had 3 recorded Nitrite spikes in 3 different tanks over 3 1/2 years..but always found them to be seemingly rapid onset though hard to judge if not testing daily. So one a year. This has been the most fatal though.
Guess that is lucky
Point is, don't ignore weird things ..