Sliceofnature Posted December 1, 2020 Share Posted December 1, 2020 (edited) Im hoping someone with more experience can help here and diagnose whats going on. I purchased 8 pygmy corydoras a couple of weeks ago. They looked very healthy and energetic. They were in quarantine for a week and a half and treated with melafix, pimafix and one round general cure. Theyve now been in the community tank for a week and have looked very healthy the whole time. I did a 20% water change 2 days ago. Suddenly today i looked in to find 2 of them dead right at the front of the tank. One appeared as if it had just died and still had full color and i couldnt see any signs of infection or sickness. I accounted for all of the other fish at the time and they all appeared energetic and happy. This evening i looked in on them again and saw this poor little cory looking bloated and struggling to swim. I attached a video below. I dont see any red spots signs of infection or lethargic behavior. Whatever it is seems to be killing them quickly. I am currently treating the tank with erythromycin and general cure because i dont know what else to do. Id like to figure out whats going on so that i can prevent this happening in the future. Temp: 73*F PH: 7.8 GH: 100ppm KH: 70ppm Ammonia: 0ppm Nitrite: 0ppm Nitrate: 10ppm Sick Pygmy Cory Vid Other corys Edited December 1, 2020 by Sliceofnature 2 Link to comment Share on other sites More sharing options...
FrozenFins Posted December 1, 2020 Share Posted December 1, 2020 You water parameters seem fine so the only reasonable explanation I can think of is when CoryDoras are under extreme stress they may release a toxin that is lethal to themselves along with other corydoras. They do this in the wild to detur a predator. If this is not the case, I really have no clue what happend. This could truly be a mystery. 1 Link to comment Share on other sites More sharing options...
Colu Posted December 5, 2020 Share Posted December 5, 2020 (edited) It could be delayed mortality syndrome cause by stress of transport and neting if it is dms it will only affect the Cory cats Edited December 5, 2020 by Colu 1 Link to comment Share on other sites More sharing options...
Colu Posted December 5, 2020 Share Posted December 5, 2020 It can cause the fish to develop an actual disease or slowly waste away 1 Link to comment Share on other sites More sharing options...
The nano tank man Posted December 5, 2020 Share Posted December 5, 2020 I cant give you much but. Maybe the food or transporting might cause stress. 1 Link to comment Share on other sites More sharing options...
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