Does this look like cotton mouth to you?

[cupanoodle]

We've had these rasbora's for about 6 months. This afternoon we just noticed this on one of them. Is this cotton mouth?
sorry for the blurry photos, these guys are difficult to get a fix on.

 

A couple questions:

- I read that the bacteria that causes cotton mouth is present in all aquarium. If this is the case what is the point in separating it?

- I have Melafix and Imagitarium bacterial infection remedy, I can dose the whole tank with all the fish or the fish separated out into its own tank. Would either of these medication be a good idea to use?

 

Tank setup:

 20 gal long, planted, inert substrate, medium light, no CO2

parameters - tested yesterday:

0 ammonia and nitrite, 10 - 30 nitrate (depending on fertilization and water changes), 7 PH, 6dgh and 2dkh.

temp: 78f

Edited March 25, 2021 by cupanoodle
adding temp

[cupanoodle]

Here is a video, might be a bit easier to see than that pictures:

 

[Colu]

 it looks like he has some fin rot is on the dorsal fin it looks like a lump to me  I would Qarantine and treat melafix isn't very effective treatment and am not familiar with imagitarium bacterial remedy I would treat with maracyn  and ich x as it also treats fungal infection 

[cupanoodle]

I zoomed in a bit, and yeah it looks like there might be fit rot as well. Though both fin rot and cotton mouth are bacterial infections as far a I can tell by googling them, so I'm not sure if I want to use anti-fungal. As far as a lump I don't see one, just the bit of silver they all seem to have at the base of their fins.

[Colu]

They two disease none as cotton mouth one is bacterial and one is fungal  if it looks like fluffy cotton it's fungal infection

Edited March 26, 2021 by Colu