I was just about to cycle my tank and had to leave for the weekend. When I left I was at 0 Amm 5ppm NitrItes and 20ppm NitrAtes. Came back and didn't even look at the Aquaclear. I just got a sample and got 0 Amm 0 NitrItes and off the charts NitrAtes. Awesome! I added Ammonia just to see if it was cycled and walked away. I didn't even realize the aquaclear stopped working. I just noticed now and it's dead as a doornail.

I took it out and it's boxed up and ready to go back to the store tomorrow. I put a sponge filter in the tank for the time being since the ammonia is just sitting in there.

I have a 30 gallon that is cycled. I have two filters on there. The tank has been cycled for about 3 weeks now. Is it ok to take one of the filters off of there and add it to my tank that is now filterless (except for the sponge). I'll have to add the new filter back to the cycled tank when I get it tomorrow.