The tank I am talking about is a 10 gallon half round with lots of plants. I have 6 pygmy cory cats, 5 male Endlers and 7 dwarf rasboras, along with a couple zebra nerite snails and a bunch of pond snails. Yesterday I turned everything electrical off to do a water change which was badly needed since I had been in the hospital for 3 weeks and there were no water changes in that time frame. My neighbor was feeding my dogs and fish and would top off the tanks when the water level dropped due to evaporation with dechlorinated water. Anyway when I turned everything back on after I added the fresh water the filter would not come back on. I had a sponge filter that I dropped in until I can buy a new HOB filter at the end of the week. I took the media out of the filter that quit and just left it in the aquarium resting against the side. Will this preserve the bacteria population in the media so that I can use it when I get the new filter to establish a new population in the new filter? And will it keep the ammonia and nitrates from spiking?