My Yellow Tail Guppy Is Getting A Hole In His Tail!

[jordan.m]

Hey guys,

On Saturday I got a yellow tail guppy I believe he is called. My girlfriend noticed yesterday that he had a tiny pin sized hole in his tail. It has since turned into a "rip". I've made an image to explain what I mean:



What should I do?

Thanks,
Jordan

 

[WILDER]

Need to look at your stats in ammonia,nitrite,nitrate,and ph.
Bacterial finrot.
Get a link for you its for betta but a good finrot site.
Have to get on top of the finrot fast as guppys soon die of finrot.
http/www.petfish.net/articles/Bettas/finrot.php