Hello. Nice fish. Very colorful. If you think your fish may be sick, the best thing to do is to perform a water change. Remove a little more water than you normally would. Then, perform your water changes a bit more often and it won't hurt to remove a little more water. Tanks less than 30 gallons really need a 50 percent water change done a couple of times a week. It really doesn't matter how many fish you have. If you have a tank that's 30 gallons or bigger, than a 50 percent water change done weekly is very good. When it comes to water changes, more is always better.I got two female bettas but the one won‘t eat.( The light one is the one who won‘t eat) Is one of them maybe sick?View attachment 319685