Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
You could just remove media from an enclosed filter (like a can) and put it loose in the tank, or enclose it with a mesh bag. If the filter is a HOB, you could scoop up some tank water and pour it in through the top a few times every few hours.
As the tank cools the bacteria slow down, so need less oxygen.
If the fish can handle room temperature water, then allow the tank to cool.
If the fish need it warmer, then wrap the tank in a thick towel, and do what you can to help the bacteria.
If you have the battery powered air running, you can also add a little hydrogen peroxide to the tank. Research the dose, it is pretty small.