Thanks! That is really reassuring! When I got him, he was red all over and then one day, he developed this white patch and stopped eating! I thought it could be fungal but wasn't sure. Can bettas change color though? I was at the pet store today to buy some live plant bulbs and they told me that bettas can sometimes change color. Not sure if this is what happened, but it could be. But when he didn't eat too and acting funny, it got me concerned. He seems to be eating better now, although if you think he's bloated, maybe I'll skip feeding him for a day or two. I read here that feeding him a pea for constipation is not a good idea, although I did get some already just in case.
Fire Cush, I did ask about external parasites and they said you can use CopperSafe or Mardel. I was at Pet Supplies Plus since some of the other major chains don't carry real medication. I'm sure some local shops also carry meds too, if you need them. Good luck!