erratic swimming behavior

Tank size: 75 gallon pH: apps 7.4 ammonia: nitrite: 0 nitrate: app 60 kH: app 100 gH: app 200 tank temp: apps 76 degrees Fish Symptoms (include full description including lesion, color, location, fish behavior): 3 Spotted "Blue" Gourami (her name is And): She (?) will swim fine for about 10...

Hi! I have had my betta fish Max for over a year now. He's always been a happy fish. However, about two weeks ago I noticed he was sitting at the bottom of the tank without a lot of movement. He was also gasping. I removed him from the tank and then did a water change, cleaning the tank with...