Hey guys, on Saturday(6/7/21) I bought 4 koi fish varying from sizes 6 inches to around 9 inches. After I put them in my pond for the first time they swam around it and was very energetic. A few hours later all the way up to now, they just sit inside a cave on the side of the pond and don't come out too often. I feed them but they don't really eat and I'm worried they might starve to death. I had 2 koi fish and 3 gold fish in the pond previously and they are all fine, they swim around normally and eat normally. Is there something wrong with them that I should be worried about? Or is it normal?