Lost one oto, probably due to transportation stress, they looked pretty well fed from the LFS. Then I lost 2 out of 10, wild caught - shame on me, Microdevario kubotai. After getting 10 Paracheirodon simulans, of which a couple didn't look too well and died within a couple of days, I suddenly started to lose the Microdevario one by one. After a couple of months I decided to get some Aplocheilichthys normani, but after closer inspection at home I discovered that some of them seemed to be very skinny and had dark blotches on their bellies and I started to lose them one by one, and now there's only two left. But they seem to be fine and I actually saw 1 free swimming fry, but that probably either got eaten or ended up in the filter, I have checked and cleaned the filter (TT EX700) since, and it wasn't there.
All this is pretty new to me. Before that I hardly ever lost a fish 🙁