Betta is Vertical

Ganaray

New Fish
Aug 2, 2017
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#1
I have a betta in a 5 gallon tank. I've had him for two weeks. I change 20% of the water a week. I have a filter and a heater set to 78. Water test was fine except the ph was low.

Two days ago my betta was behind the filter facing up. It swims rarely. It mainly only moves to get more air. It hasn't eaten. Is there anything I can do?