Is This Columnaris?

[Luanda Pym]

Hi wondering if anyone can help.
My male swordtail has something looking like an anenome type of growth at the side of his mouth. Didn't notice it when i bought him but the tank is a month old and fish only in it for 2 weeks, so I'm guessing it's not something from the tank. Ammonia, nitrates and nitrites all fine but will check again tonight. Only bought and put the swordtail in on Sunday 4th Dec, no other fish looking ill, he doesn't seem bothered by it at the moment.
I thought he was eating a bloodworm and had the end sticking out but it looks like its attached to his mouth, it is about 0.5mm in diameter, round with small whitish fronds just at the far end.
I'm very worried this is columnaris, if it is what is the best way to treat, I will seperate him tonight when i get home. Will change the water tonight for the other fish but what about my established filter media??
Can anyone give me a hand?
Thanks for any help
Lu P
Unable to take pics but will try on my phone tonight, not sure that will work but we'll see.

 

[Luanda Pym]

Sorry, forgot to add
we have changed 20% of the water each week so far and clean the gravel at the same time.
i added a sludgebuster on Sunday when we changed the water just before we added the new swordtails (1 male affected/infected, 2 females unaffected) once i noticed something white on his mouth i added white spot treatment but have since researched and think it might be columnaris. I want to get the best treatment and not mix meds. I'm thinking copper sulphate but want to check out what the experts think first.
Water readings on Sunday (before water change) were nitrates 40ppm, nitrite safe-test daily, ammonia the colour was a deep yellow, not the buttercup yellow of 0 but not greenish, temp 78F, pH 7.6, rinsed off fine filter media on Sunday in the fresh syphoned aquarium water from the water change.
his behaviour is fine, swimming out in the deep open, attentive to females, no flicking or gasping, no rapid gill movement or rubbing. He's eating fine, his colour is superb and he's socialising well with other fish
thanks for any help you can give
Lu

After reading up on columnaris, i'm now thinking it's not this! The area of the "anenome" is not red or inflamed, there is no cotton wool like fuzziness, it is just one spot (actually looks like acne spot) on his lower lip which is raised about 0.2mm high and 0.5mm diameter.
Have read the comprehensive post on common fish disease symptoms and it doesn't fit with any of these except perhaps cancer!!

Here's a hopeless drawing of what i've been puzzled by

 

[WILDER]

http/article.discusnews.com/cat-02/columnaries.shtml

 

[WILDER]

Sorry did read the post properly, don't no what you mean, could it be a parasite attached to the mouth does it have a forked tail.

http/www.webdezine.freeserve.co.uk/parasites.htm

http/www.biokombs.com/parasites.htm

Might as well ask just to make sure does the thing on his mouth look like a cauliflower.

 

[Luanda Pym]

Thanks for the sites, the only thing that it might be is Argulus (spelling?) but i can't see any legs. I'm now convinced its not columnaris, which is a big relief!
Perhaps i over reacted yesterday as last night the "blip" looked smaller and as if it was healing nicely. i will obviously keep a close eye on my wagtail but thanks for all the info.
Cheers All
lu
ps all water stats all checked out fine last night,
Ammonia 0, Nitrate 40ppm, nitrite 0.2ppm, pH 7.6-7.8, temp 79

 

[WILDER]

Good luck.