what is the temperature inside the room or house/apartment the fish is kept in?he could be cold as well..in a 1.5 gallon i would change the water about 3 times a week.in my 2 gallon i change it about 3 times a week.
i would try to get some Freeze Dried Bloodworms.pellets are ok.but from what i read the bloodworms are a great source of vitamins etc it needs...
oh when u do the water changes.i actually change about 50% everytime.i know some may read this and say i need to change more.but i do a 100% change monthly.
i was going to ask if he is eating but as i see he spits it out..
since u have a 1 gallon.i would try adding a little aquarium salt for a few days.it helps reduce stress and helps prevent against diseases.i think its like 1 teaspoon for 10 gallons of water.i usually put in a little less than 1/4 teaspoon in my 10 gallon if i need too..
is their any way of getting more light on the picture to see the white bubbles on his head?ill try to do some research about that online and see what i can find..