ok so i have a comet goldfish. now lately he/she(i really dont kno) has been acting up. like before he/she would swim around like crazy, really fast and such but now it just seems to lay around alot. i did my water change today but it didnt help. also his/her fins also look kinda of pink/reddish. im not sure what this means but yea. he/she didnt even come up for food today. also when she ate before, my fantail keeps pushing him/her to get food for itself. i really would like to know whats wrong