We came home this evening to 2 of 3 Cory's dead and rotting as well as 1 4" Pleco and a 1" bull dog pleco in our 16 gallon tank. These fish were all very healthy and active on Friday evening when we left. We added a orange laser cory last weekend, the 3 cory's played in the bubbles all week, perfectly healthy and happy.
We replaced a heater Monday, and slowly raised the temp of the tank 75-78 degrees from 72ish when we discovered the old heater wasn't working. As I mentioned we added an orange laser Cory and 6 green tetras last Saturday and we added 2 foods for bottom feeders we picked up when we were in for the fish last week, both we have fed before as we mix them up for variety.
What ever killed them, it was fast, they looked like they had been dead for a several days, not just a couple. The large pleco had what looked like a jellyfish around him.
We have done a 50% water change, as the water smells horrible and I did a good cleaning of the bottom. Any ideas what could have caused almost all of our bottom feeders to die so quickly? We have a variety of tetras in the tank as well as a hilltop loach that are all fine.
Marcy