Lost one of my two male bronze cories
And it's my fault.
Tank has been stable for a while, so I've got a bit complacent I guess? This 34g was due for a water change this weekend, but today I was focusing on the 16g pygmy tank which was a bit of a mess, so I spent a long time cleaning, cleaning filters, fussing with plants etc. Finished mucking about with it at like, 6pm, went to sit down with a coffee and looked over at the 34g, and saw bronze cory spinning, then laying on his side.
Panicked - they'd all looked okay this morning when I fed them, so I took water samples for testing and added some Prime, just in case, before doing the water tests, and put the spinning cory in a breeder box. Did the tests and ammonia and nitrites were high.
I had added two pretty large cory tablets in there this morning... I usually use one, but there are 16 (now 15) cories, two plecos and a bunch of shrimp in there, along with the tetra and livebearers, so I didn't think it would be a problem. But I'm suspecting it was that. That they didn't finish all the food, and it released ammonia in there all day without enough fast growing plants to help.
Rushed through a 60% water change, moved all the wood and stone out to give the substrate a good clean and to search for any dead fish. Went into a full panic attack while doing it, so was struggling to carry buckets while struggling to breathe, and feeling worried for my fish. By the time I removed 60% of the water and returned with a bucket of new water, the cory had died
I found a couple of dead shrimp, and that a load of roots on an amazon sword had rotted, but otherwise, can't see signs of any dead fish, will do a headcount in a minute.
Moved a big bunch of hornwort in there and have refilled the tank now - how long should I give the water to mingle before I do another water test?