I cleaned my fish tank tonight, cleaned out the rock and everything. before i put my fish back in the tank i checked the water temp. it was at 70 degrees. my fish were all hudled at the top of the tank. then they started floating upside down. and had started to die. So i put them in some other room temp water,thinking this might help. they are still continuing to die. What have i done??

If these fish are discus, they need water temp of about 80 to 82 degrees, They are probably in shock from the cold water.

__________________
SUCCESS IS MEASURED BY YEARS, NOT MONTHS!!!
220 Tank build
http://www.aquariumforum.com/f15/sta...late-3253.html

Susan is right. You need to warm up the water before adding it.
Don't mess around with a sensitive fish like discus.

Also check the Ph level and hardness and add some sodium thiosulfate if you use chlorinated water. Also check for these parameters after 12 hours.

You can read some info about discus water needs here.

__________________
I have 3 Main discus aquariums and 4 breeding tanks. Also got two emergency tanks and Emergency backup systems for all of them.

What did you use to wash everything and what type of fish do you have.

Yeah, some more info please:
details of the cleaning you did
how long the tank has been set up
types of fish
size of tank
that should be good to start with.

__________________
10gal fry tank planted with Wisteria, Java Moss, Anuabis and Anacharis
35gal Sponge Bob tank with live bearing tropicals (daughters tank)
15gal planted with Swords, Java Fern, Wisteria and Red Rubin housing 10 fry and 2 bladder snails
55 gal with Oscar (future planted tank with angels and flowerhorns)
55 gal Community tank (platys, mollys, guppys, glass catfish, angels, phantom tetra, red eye tetra and swordtails)

Did you change any of the water?