Need advice fast-sick fish

[mousey]

$ weeks ago a small loach died of a wasting condition. I had bought him in Feb.and he ne er did well. His brothers are fat and healthy.
Then about a week later i found a full grown siamese algae eater dead in the tank. Its sides were redd but I thought it was because it was stuck part way into the loaches hiding tube.
I noticed the blue gourami i have had for 4 years had a thing about the SAE's and was chasing them around.
The male gourami I had for about a month was ok at night but the next day I found him dying with a red stomach.
Took him out of the tank. Got rid of the female gourami and bought 3 pearl danios.
Found 1 dead on day three.
Replaced the danio. Found another SAE dead on a leaf -- abdomen red again. and today i had 3 danios at 8am but by 4 pm I only had 2. I found just a head and a fin on the gravel.
All these fish were fine-- no red streaks or listless behaviour, then dead about 7-8 hours later.
I went to lfs and got some erythromycin .
They suggest perhaps the original loach had a parasite. None of the fish that died had died got to eat any of the loach as i removed him before he died.
The gourami probably had parasites as he had thin white poops.
However i have not read that parasites cause any fish to die within hours of appearing healthy.
LFS suggests I treat for parasites and bacterial diseas with erythromycin. Anyone else have an idea??

I have Flagyl but it cannot be used along with other meds, so i will have to wait until i have finished treating with the erythro.
HAs anyone any idea what is going on?

[girth vader]

very sorry to hear about your fish. And the same thing happened to me. dusted off 2 angels, 4 gold rams, 2 blue ram, 2 powder blue gouramis, and a Iranian red rinbow and a clown loach before I figured out that it was parasites in the frozen brine shrimp i was feeding them. I used Big Als brand, and they dont gaurantee against parasites. Once I stopped feeding them that I had zero other losses. They displayed the same behavior, stopped eating, red belly, thin white poops. Now I just buy Hikari and they gaurantee 100% against parasites in their frozen foods. tough lesson to learn, but I learned none the less.

[mousey]

Interesting.
I have been using their frozen blood worms for about 5 years now and this is the first time I have had problems.
I have been feeding live white worms that i culture myself.
I would have blamed thegourami that I bought. An sure he had parasites. Never had anything go thru the tank this fast.
Did youtreat with anything?
This is going to be a major hassle as i am treating the whole tank!I hope it doesn't kill too much of my bio filter. I am fed up with water changes. I just moved some of my tanks up into larger, transfering all the media and gravel and still had a ten day spike in ammonia and nitrites.
i wonder if the first loach that died of skinny disease infected the tank? The probs started right after he died but why would it take 6 months for him to infect the rest.

Yuck!
You in T.O?
I am in newmarket