Three weeks ago, I introduced some yellow endlers and fancy tiger guppies to my tank.
I had blue endlers and “sunset” guppies in the tank already.
Since I added the yellow endlers and tiger guppies, they have (I think) been quite aggressive. All of the blue endlers have been killed off, and 4 of 6 sunset guppies have been killed off.
I didn’t introduce an illness to the tank. All of the rasboras, corys, shrimp, and tetras have not been negatively impacted. They are as healthy as ever.
also, the yellow endlers and tiger guppies are all healthy.
I didn’t think guppies/endlers would kill other guppies/endlers. I have never added some fish to a tank and had all of the new ones live while the fish already in the tank die off.
Could it be the new endlers and guppies killed off the “old” guppies and endlers?
[Of note, I have never had a die off like this before. In three weeks, 13 guppies and endlers have been killed or ended up dead. I acclimated the new fish to the tank via drip method.]