Dead Shrimp

what are your nitrates?

Once mine got over 50ppm, they started dieing.

temp, copper, any kind of outside contaminants???

Yes you must test the water immediately and see what levels of all parameters are.

I highly suggest doing a 50% water change immediately after you conduct the tests.

Thanks,
Ryan

I just did a 75% wc and most of them seem better but there are still a few laying on their backs twitching. Its so weird. I didn't test for anything else and I already dumped the water. Hopefully I can save enough to rebuild.

Well I still don't know what caused my catastrophe but there are at least 100 dead shrimp. most under 1/2" And most new born shrimp. There are many shrimp that are still alive but paralyzed and twitching. Any thoughts on what could cause such a large number of deaths but leave some shrimp un effected?

Any new recent additions to the tank (fish, shrimp, driftwood, anything else)? How long have you had them? How many shrimp do you have in how many gallons?

And paralyzed, twitching shrimp are as good as dead. So you have no more healthy shrimp?

Did you forget to add dechlorinator with your last water change?

why did you throw away the evidence?!
You can't learn from your mistake.

is this a planted tank? I think plants would help out in these catastrophies. I neglect my shrimps and they're fine in a planted low-tech tank.

I did forget to test the water before the water change. There were somewhere between 150 and 300 shrimp from full grown adults to the smallest of babies. They were mostly cherries with about 20 rainbow(wild RCS) 10 green and 10 tiger. The only ones I could see visibly dead or twitching were RCS. The few greens I saw today were acting normal and I didn't see and tigers today.
I have had this shrimp tank up and running for about 1 year. The only thing in the tank is shrimp.

sandiegoryu said:

Any new recent additions to the tank (fish, shrimp, driftwood, anything else)? How many shrimp do you have in how many gallons?

Did you forget to add dechlorinator with your last water change?

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Something poisonous definitely entered the water. Did anyone spray windex near the tank while cleaning the house? What about room spray air freshener?

wood said:

Something poisonous definitely entered the water. Did anyone spray windex near the tank while cleaning the house? What about room spray air freshener?

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It does not have to be something poisonous outside the tank.
It could have well been something inside the tank...I do not see details on what the tank has in it apart from shrimp.

What type of iltration you use?how do you clean your filter media? What about tank temperature? Any plants, driftwood, other things in it? what susbtrate are you using, if any? How many gallons is you tank?

That would be good place to start......when was the last time you changed out your filter eliment? I usually rinse my slides once a week to clean off the waste products. Do you have a water filter on your incomming air?
It really doesn't take much to actual get an air born pathagen into a tank.
Water filters are good for prefiltering the air before the tank.
A year and then this.......8>o.......sorry to here of it.

Maximo