Hi..I bought a dogface puffer about a month ago. He adapted nicely to my aquarium and seemed to be very happy in his new home until 2 days ago. Two days ago I did a water change and a few hours later I noticed a drastic change in his color (light brown to a very dark brown). He also has puffed up 3 times. I've done a chemical test and checked the salinity and everything is where it should be. Please help me I can't think of anything else to do. Thanks!
--Jerene
--Jerene