All My Fish Look Ill!

[simian]

My tanks has been up and running for four months now. The parameters are all fine. Ammonia 0, Nitrite 0, Nitrate 30 and PH 7.4. It's a 100L tank that I don't think is over stocked.
Yesterday I noticed that one of the molly's had whitish looking gills. One of the corry's was a bit gray and scratching a lot. On closer inspection a lot of the fish seemed to have very rapid gill movement (sorry I'm not good with the jargon yet). Even though the water stats seemed OK I was still concerned and did a 20% water change.
Today when I came home from work, one of my Angel fish was dead. And most of the fish were swimming at the surface. The stats were still fine but the fish clearly weren't. Out of desperation I did another water change, This time 50%.
They're all still at surface. Even the loaches are at the surface and which just looks wrong.
I've ruled out "White Spot" as I can't see any white spots. I haven't added anything to the tank in quite some time apart from the odd bit of live dafnia or bloodworm.
I have no idea what to do, I predict it will get worse before it gets better. I'm having visions of coming home from work tomorrow and finding most (if not all) of them dead. I hope I'm overreacting.
Any advice welcome!

Stock:
3 molly's
3 guppies
3 clown loach (I am aware that these need to be moved to a larger tank sooner or later)
2 angels
4 columbian tetras
3 apple snails

 

[WILDER]

Sounds like gill flukes and skin flukes.
Any excess mucas on the gills and body.
Get you some info.

Never noticed ny harley swimming in a jerky movement.
Signs of gills and skin flukes are.
Opaque body with excess slime.
Pale gills with excess slime, or red and inflamed.
Flicking and rubbing against objects.
Erratic swimming.
Swimming in a jerky movement.
Laboured breathing.
Can lose weight to flukes.
Sores on the body of the fish.
Spitting food out.
http/www.aquaessentials.co.uk/index.php?...products_id=138



Your tanks overstocked.
How big are the clown loaches.
http/article.dphnet.com/cat-02/flukes1.shtml

 

[simian]

How big are the clown loaches.

About 1.5 inch.

I'll research gill fluke now but is it easy to treat or not?

 

[WILDER]

Some flukes are egg layers so the med kills the adult parasites, but then you have to retreat to kill the young parasites when they hatch.

 

[simian]

ok thanks. I'll start there then...

 

[WILDER]

Look under skin flukes.
http/www.fish-disease.net/diseases.htm

http/www.aquarist-classifieds.co.uk/php/detail62_45492.php

 

[WILDER]

When you said white gills do you mean pale.

 

[simian]

When you said white gills do you mean pale.

It was only one of the molly's and one of it gills was/is pure white.
I should mention that all of this started suddenly. Everything was fine for months, then suddenly they all looked very ill and started behaving strangely. I'm wondering if something toxic, such as a household chemical has got into the tank.

Going back to the stock levels. As the three clown loach are only 1.5 inch at the moment, would you still say that the tank is over stocked. It's just that I thought that I was being very careful not to over stock it.

 

[WILDER]

Signs of toxins are.
Gasping at the top of the tank.
Dartig around the tank.
Laying upside down in the tank.

 

[simian]

Signs of toxins are.
Gasping at the top of the tank.
Dartig around the tank.
Laying upside down in the tank.

Yes that's exactly it. I'm more an more convinced that it is toxins in the tank. Last night and this morning all of the fish were gasping at the top and the clown loach were upside down with there mouths at the surface.
This afternoon they appeared to be much better. I did another massive water change and now they are looking a lot better. I don't want to tempt fate and say that I think that they will be alright. I mean even if they are on the mend, how do I know that any permanent damage hasn't bean done due to exposure? (Am I sounding like a glass is half empty guy?)
Anyway, Fingers crossed and thanks for your advice Wilder.

 

[WILDER]

I don't know to be honest.
It depends if the toxins have gotten into the fish system.
How did chemicals get into the tank if you don't mind me asking.

 

[simian]

I have a feeling that my wife used organic window cleaner to clean the tank. She said she didn't but I'm not convinced.