Hi i need a bit of advice about one of my guppies i have about 12 of them and today i noticed one of them (a female i think) sitting ontop of the filter not really moving so i lifted the lid and she moved but she is swimming really oddly like shes rocking rather than swimming she can get from one end of the tank to the other slower than the others but she can still get there i've also noticed she has a bit of red near her gills i read about gill flukes but i'm not sure if thats what it is or not none of the others seem to be ill just her any advice pls thanks KT