White strings on guppies

[nblaise]

I have had this orange fancy tail for a year at this point. He’s always had a raggedy tail, even when it was just him and females. The past three months; he’s been living in a fraternity of 6 guppies and 3 endlers. Last weekend I introduced some Siamese algae eaters to the tank (without quarantine; bad, I know, save your breath), and then I started noticing these thin white hair-like strands coming off of his tail most extremely. There are some tiny ones on a couple of the others, noticed one on a dorsal fin, and one on my pink tuxedos tail, I’m sure it’s a growth and not rot. 
 

tested my water this morning and it was;

pH: 7.4-7.6

ammonia: between 0 and .25 ppm

nitrite: 0 ppm

nitrate: 40 ppm

https://imgur.com/gallery/bZGseaj

 

 

Edited February 2, 2021 by nblaise

[Colu]

Can you take picture of sick fish and your ammonia should be at 0 I would do a 50%water change 

[nblaise]

[Kirsten]

I suspect anchor worms http://www.tetra-fish.com/learning-center/troubleshooting/fish-illnesses-how-to-spot-them.aspx

Not sure if paracleanse works on them, but treatment sounds pretty intense one way or another http://freshwater-aquarium-passion.blogspot.com/2010/11/treatment-for-anchor-worms.html