Maybe about a week ago two of my synodontis petricolas were found floating at the top of the tank. It had clearly been a day or two. I tend to forget about the tank sometimes other than tossing in food.
I was particularly intrigued when I heard thrashing at the water's surface and whipped out a nice 1.5w LED flashlight and to my dismay, all 8 of my petricolas are at the top gasping for air, along with my two SAE. Otos, rams, and all but one cardinal seemed to be okay
Two of the petricolas along with one of the cardinals were lifeless at the top. The cardinal had some sort of disease and was pretty much pineconing up until his death. Could it have been this one fish that got my two petricolas killed? I was in no position to think, the wretched smell was one that would make anyone run to grab the python. 2:30am and I'm doing an emergency water change on a tank that hasn't had one for nearly? half a year.
Over the course of two days and 4 water changes (starting from 30% and gradually increasing to a final one of about 65%) and some new fresh NLS food since I ran out, everyone is delighted. But I am still stuck with this swampy smell. Does carbon really work well? Should I keep changing water?
On a side note, things really do come in threes. My NLS food ran out, one of my cheapo t5ho lights burnt out, rendering my fixture useless, AND three deaths