How often do you change the water and how much?
Gasping for air at the surface and/or laying on the bottom being lethargic are signs of ammonia issues.
Do you notice any red streaking on the fins or body or red/purple gills?
If you guys have an ammonia test kit, can you test the water and post the results?
It could be a number of other things but a water quality issues is what pops into mind first. I would suggest a water change to rule out water quality issues. However for a 55 gallon tank, not sure how much that would be.
Baily- what do you feed him and how much? how big is your tank? last water change?
For the ones with the betta in the community tank - are the other fish acting ok?
Are these new tanks that have just been set up with a filter running? Or have you guys had them for a number of months? What I'm wanting to know is - have the tanks finished the nitrogen cycle if you have filters in them.
EDIT: If you all could answer these, that would be a big help:
What size is your tank?
What temperature is your tank?
Does your tank have a filter?
Does your tank have an air stone or other type of aeration?
Is your tank heated?
What tank mates does your betta fish live with?
What type of food do you feed your betta fish?
How often do you feed your betta fish?
How often do you perform a water change?
What percentage of the water do you change when you perform a water change?
What type of additives do you add to the water when you perform a water change?
Have you tested your water? If so, what are the following parameters?
Symptoms and Treatment
How has your betta fish's appearance changed?
How has your betta fish's behavior changed?
When did you start noticing the symptoms?
Have you started treating your fish? If so, how?
Does your fish have any history of being ill?
How old is your fish (approximately)?