I'm about to start research, but does anyone have ideas:

I have a neon tetra that has always had coloration that was a little darker than the other 5 neons, but today he has a small white sore-looking thing on the end of his to spine near his tail.

He looks a little darker than usual. I could move him to my 10 gallon with the guppies and take him out of my main tank.

No other fish have any visible signs (5 neons, 5 rummy nose tetra, small group of cory catfish)

My fish have never shown any agression, so I can't image that anyone could have bit him.

He just ate a few bites.

I am really worried that my other fish could catch whatever it is.

Help!

It doesn't sound like ich, but I'm not an expert on the diseases. Make sure it's not columnaris though, I lost both my fancy goldfish in a day from that. :(

It is definitely no ick. I have not fed any live foods or introduced any new fish or plants in the tank.

Maybe he has the flu of the fish world... Lymphocystis...

That describes a lot of different things though... most of which are unlikely as you havn't introduced anything new to the tank... but I'll run down the short list...

Lymphocystis
White Grub
Yellow Grub
Ich
Fungus
Chilodonella
Ichthyosporidium
Tuberculosis
Argulus
Ergasilus
Glugea
Hennegua


Sorry that's so long, without at least another symptom to narrow it down some more...

That's the strange part. He doesn't really have any other symptoms. he schools with the others, eats, doesn't gasp or do anything strange.

I guess I'll just keep a close eye on him

Thanks for any more ideas!

my answer is the h2o temp? keep it within 72- 75 degrees higher the temp makes the colors fade, lower the temp you have it now 2 degrees.

Could the temperature account for the white sore?

None of the other fish are fading.

Should I still try the temperature thing? Its 78 F

Thanks!

If it is a cotton like patch, it may be Saprolegnia..which is a fungus.
That is just a guess, because if he doesn't seem to have any other symptoms.

It hasn't got any worse and no other fish are affected, so I think I am just going to keep an eye on him.

Thanks for the input any if anyone else has ideas, please post.

Thanks!

Still sounds like Lymphocystis to me, which if it is, there's nothing you can do anyway.

Did you move your fish? Is there any new news on him?

He's still in the main tank.

I looked at bunch of pictures, its not lymphocytis. The white area is not 3D or raised. It doesn't appear cotton-like. The white area seems to have shrank since yesterday.

My main concern now is the light greyish areas on him. It looks really weird- kind of clouded type looking color.

He doesn't rub or anything or seem to be in pain. I guess I'll leave him in the main tank for now. The other fish don't seem to be affected.

Any ideas on the grey coloring? It doesn't cover his coloring, it kind of mixes in.

Thanks!

ohh, well now we're getting somewhere... brb :blink:

Ok, that narrows it quite a bit... now I'm thinking: Ichthyosporidium

Sergeant Major- I looked that up. Very confusing- it said that there wouldn't be any outward signs until the fish is having abnormal swimming patterns and lack of balance. Am I reading about the right disease? I don't really notice any strange swimming.

That is very frightening! You don't think I need to put him down, do you? I don't want to do anything rash.

Saturday I did a water change. I treated the water and took all of my usual measures. I don't want the whole tank to become infected and everyone die!

I'm really worried. :(

I'm sorry I can't think of anything more descriptive.

Well the white and cloudy patches under the skin fit with that, and I couldn't find much else they were consistent with that fit the rest of the circumstances...

Unless you're seeing ulcerated patches (open sores/possible bleeding)...

To me it sounds like body fungus. It being gray in color that is what I think.

Is the body fungus highly contagious or dangerous?

does it look like this? if so it is saprolegnia, just treat with fungus meds.

Are you referring to the greenish area on the fish? Its kinda hard to see the picture

Thanks, though

Ditto on the gray patches. Symptomatic of Columnaris or body fungus. Maracyn is a treatment for this. As for the white spot, I think I need more info or need to see a picture.

Catlover, has there been any new signs? How is he doing? Sorry, I couldn't find a better picture. But from what I have read it seems to be body fungus. Were you able to get a pic like fishyfry asked? We are anxious to find out any info. for other viewers with the possible same symptoms, and the methods you have used to cure him. ;)

Hi guys, He looks much better today. I think that I may have been being kinda paranoid. When I walk up to the tank, it takes careful examination of the school to identify him. Its not reallly that noticeable now. You really have to study him when he's going towards the right to see any discoloration.

I think there may be something to do with tetra sometimes that when it has been pitch black-at night, and then when you turn on the room light then the tank light, I think it kinda takes them a few minutes to get their colors. My tetra don't come out of the caves or plants as quickly or gung-ho as some other fish-like my guppies. It kinda takes them a minute to emerge. Have any of you noticed this with tetra?

Thank all of you so much, I will keep a close eye on him and post if any discoloration comes back.

Do you think it could have had anything to do with I did a water change Saturday- about 6 gallons. Then I noticed it on Sunday?

hmmm... not sure about the water change, but I have noticed some fish take a minute to get their color first thing some mornings. I never had Tetras, but a Pleco I used to have did that and the Rainbow Shark sometimes too. I have read where others hobbyists comment on the phenomenon as well.