Powder Blue Dwarf Glutamine Mouth Problem!

We've had our Blue (male powder blue gourami) about 5 months, and he has had a kind of growth near the side of his mouth for most of that time. At first it just looked like he had irritated his face on something, as he is always ALWAYS rummaging and picking at everything for food scrap in the strangest positions and places. This has happened once or twice, in addition to this "growth", but those wounds healed up quickly. This fish also lost his whole tail, one of his feelers, and a good deal of his upper and lower fins (not to mention the gouges on his head and sides) when we found him wedged inside a decoration and had to buy cutters to apply the jaws of life. He stayed in a tank for about 3 weeks alone and healed up quite nicely from that too... But this growth will not go away! looked like even that had healed while in the qt tank, which is why I put him back in with genpop. But it started to come back after a week in the regular tank. It actually got worse! It's like a reddish spot with a gauzy looking area around the edges. It sticks out on the side of his mouth. He will not stay still for a picture. His behavior is pretty normal, appetite normal, pooping normal. And like I say, he's been living with it for months and we are stumped. None of the other fish have (or have had) any signs of this same issue.

( 25 gallon tall; 4 glowlight tetra, 2 black molly, 1 Cory, 1 young adult sailfin pleco...9", 1x1.5in mystery snail, and 3 zebra danios...and one other runt tetra that has been bullied by his buddies so he's away from them right now to regrow fins)

Water temp and quality is within decent common levels for all occupants. No one else seems affected. I've read of applying peroxide directly, but also read horror stories of skin peeling and some stories of subsequent deaths. Any help would be great!!

Also, before the whole pleco discussion gets started, I know he is technically just about outgrowing his current place....he will get a new tank soon. Although he has ZERO trouble getting around, he just disturbs the other small guys with his tail when he zips to the top to gulp air. ☺

 

Gunna need those exact water parameters, and a picture would be helpful. I’d say that Pleco outgrew the tank about 4 inches ago

 

Sorry, I'm out of town until tomorrow. The person taking care of the fish doesn't really know how to do the in depth testing, but readings from the stick test were unchanged from the usual readings. (7--7.5 ph, 0 nitrite, slightly higher nitrate (40ish, possibly due to Mr. Kite, the pleco?) The issue isn't crazily sensitive, as he doesn't seem to be acting differently. And no one else seems to be either. The pinkish area in the center seems to have gone away, according to the caretaker. It is now just white, and slightly fuzzy looking...but not stringy. But he doesn't stay still to get a good picture...he's too fast.

I've read a ton about columnaris, and cotton mouth, gourami mouth fungus. My eyes are about to pop out! Also read about pop-eye, by the way...In my travels online, a lot of accounts say the fish has died pretty quickly from most of these diseases. I guess the main question is what safe remedies are there for gourami? I used a majorly diluted tea tree oil solution for him when he tore himself up in our decoration, and he seemed to tolerate it ok. But it's warned against in some blogs, etc. Same with aquarium salts.

 

PS, I do very regular water changes, about 5 gallons twice a week. 5 gallons to vacuum, and 5 gains just taken out and replaced.

 

Sadly, my little tetra that I had been caring for succumbed to whatever he had been fighting. I believe something was wrong with his batch of glowlights when I bought them. Only he survived...the runt...out of 3. It was most likely a bacterial infection that initially caused lack of appetite and downward swimming in all 3. Sudden death happened with the first two. This little guy made it a about a month longer with isolated care. I thought he had been bullied by our larger glowlights, but I found him say the bottom of the dt and moved him before the Cory could eat him. The disease caused him to lay at the bottom on his side, also he was missing fins...but those regrew. He had the bent spine and couldn't get around due to fins so I think he starved. Even though he seemed to be improving at the end...eating more, getting upright on his own...pooping. I'm pretty distraught over my poor Nemo.have spent so much time trying for him, and he fought so hard. Was always excited to see me, even though he was so sick.

 

Update: after the loss of my sweet little fish, I started treatment with Paragard on my whole tank. After reading as much as I could find, I decided (and the lfs guy agreed) that there seems to be velvet and columnaris at work here. Gourami is probably suffering with columnaris, the Molly probably both have velvet because they insist on writhing together...thus spreading disease faster. I was told paragard should help with both of these things. How long should it take to see improvement? I started at 1/3 dose just to make sure my more sensitive guys (catfish pleco and snail) would be ok with it, now at full doses. Started 3 days ago. Seems to at least make the sickies feel comfortable and not stressed for right now. Also, told lfs guy our readings and he said it all looks good. Danios, tetras and molly all breeding like mad. I try to catch eggs and babies but our tank is quite carnivorous, and it's often when no one is around. He said the danio especially won't breed in bad water, and they're going at it all the time. So....water params are all good. This is a stress issue... our tank heated up to 82 one day when our building turned on our heat and it was crazy hot in our apartment, causing everyone to tweak out.