Unknown Disease/parasite Help Please

Video of the problem I would really appreciate if anyone could help me out with this. I treated for ich for 7 days and there were no changes. He is the only fish affected.

Tank size: 20gal U.S.
pH: 7.2
ammonia: 0
nitrite: 0
nitrate: 10ppm
kH:
gH:
tank temp: 79f

Fish Symptoms: Male gourami, has a white/yellowish lesion behind his left pectoral fin, occasionally will rub against a plant, darts a few times an hour across the tank and sometimes hits the top of the water hard enough to splash it. He is otherwise healthy, he has a normal appetite and continues to hang around with the female.

Volume and Frequency of water changes: 50% approximately once a week. I usually do them as I deem necessary according to the amount of waste.

Chemical Additives or Media in your tank: HOB filter, I add salts when I do water changes, I use Flourish ferts, and I use a stress coat to treat the new water.

Tank inhabitants: 2 pearl gouramis, 3 platys, 1 common pleco, 2 guppies, 2 african dwarf frogs, 4 ghost shrimp.

Recent additions to your tank (living or decoration):

Exposure to chemicals:

Digital photo (include if possible):

I attached a photo that does not really show the lesion, but I have included a link to a short video that kind of shows it. http/www.youtube.com/watch?v=2FQspU015fE

I'm blind as a bat. Getting old and eye sight not what it once was.

Can you describe in more detail what you are seeing on the fin.
Is it a lump, or parasite.
Any red streaking on the fins.
Also check the fish for these signs.

Flicking and rubbing.
Excess mucas.
Darting erratic swimming.
Laboured breathing, or gasping.
Red sores or red pin prick marks on the fish.

must admit i cant see anything
mind you it might not show up that good
on video i to wear specks like

WILDER said:

I'm blind as a bat. Getting old and eye sight not what it once was.

Can you describe in more detail what you are seeing on the fin.
Is it a lump, or parasite.
Any red streaking on the fins.
Also check the fish for these signs.

Flicking and rubbing.
Excess mucas.
Darting erratic swimming.
Laboured breathing, or gasping.
Red sores or red pin prick marks on the fish.

Click to expand...

He does dart and sometimes hits the top of the water hard enough to splash. He does occasionally rub that side but it is not persistent. No red streaking, and no obvious normal signs of ich. (no little sugar like crystals on his body). The thing just behind his fin looks like a whitish/yellowish herpe.

Does it look like a blister filled with fluid.
Make sure the herpe thing dosn't resemble a cauliflower.

Are any of the other fish flicking and rubbing, or darting.

WILDER said:

Does it look like a blister filled with fluid.
Make sure the herpe thing dosn't resemble a cauliflower.

Are any of the other fish flicking and rubbing, or darting.

Click to expand...

It kind of looks like skin (not with scales) that has grown out. The other gourami does flick sometimes but not even as much as him, and usually hits the water surface right after he does almost as if mimicking him.

Get a magigying glass to take a closer look to see if you can see any parasites.
Any excess mucas on the area also.
Is there any bumps beneath the skin.
Also shine a torch on the area with tank lights out to see if you can see any golden bits shine up.

Is there any snails in the tank.

WILDER said:

Get a magigying glass to take a closer look to see if you can see any parasites.
Any excess mucas on the area also.
Is there any bumps beneath the skin.
Also shine a torch on the area with tank lights out to see if you can see any golden bits shine up.

Click to expand...

I do not see any parasites, I also do not see any lumps under the skin, and no golden bits. Upon closer inspection with a torch the area almost looks as if it is torn away from the skin there.

Ok.
There not showing enough symtoms to point it towards anything.
Check water stats again.
I would maybe half dose some melafix with the herpe thing just to stop infection,

WILDER said:

Ok.
There not showing enough symtoms to point it towards anything.
Check water stats again.
I would maybe half dose some melafix with the herpe thing just to stop infection,

Click to expand...

Thanks very much for all your help. I will keep you updated if anything else happens.

Keep a look out for signs of more fish darting, flicking and rubbing, excess mucas, laboured breathing.
If the herpe start to change, get back to the board.