Wow! I just read that myself. I apologize for whatever happened. I posted on my phone, I'm not sure what I did. She is a pea puffer, and I doubt its a water issue because my male and oto are fine. I'll post the parameters in a minute anyway though.
I understand Tom. I don't think there is anything I can do anyway. I doubt it's the water. This tank is really solid, and the levels were about as close to perfect as one can hope to get.
Her other two tank-mates are doing really well. If I had to take a stab in the dark she might have been plain bullied away from food. The male is older than her and they weren't introduced together. I should have made a point to look for her sooner. The tank is densely planted and sometimes I wouldn't see either of them out all day. he move took up too much of my attention I suppose. I just hate it when I kill fish. I was hoping someone had a secret miracle fish saving trick.
Did you read my post about possible things? I could tell it was a puffer because you're using feeder snails. Please refer to my post above if it helps?