I have had 4 sailfin plecos in the past few days die on me. One is common while the other 3 are albinos. They stop eating for no reason. Even the cucumber which I regularly put in my tank is ignored. I also have a driftwood which they munch on from time to time. The first one is a good 7" which I had for 4 months from about only 4". The second one is an albino which I had for 3 months from 3". The last 2, I just purchased last week and then all died yesterday. Actually one of these 2 was bitten by one of my fishes as it was weak and lying on the bottom so it was rushed to its death. My water parameters are perfect. They just stop eating and then they wither (become so thin) slowly until they just rest on the substrate and die. The eyes have moved inwards due to thinness. I had a chlorination accident 2 weeks ago which I attributed to the first 2 dying but the last 2 are new so I am baffled. My other fish are active and have no issues, eating well. I don't see any aggression towards the plecos as they usually are attached to the glass panes. Do you know if there is any chemical that can kill them specifically so I can single it out and test it? That is my first hunch but I'm not sure.
