That's good to know! I replaced them since I had to break out an old filter for the fry tank and I didn't want to use a filter that had been collecting other bacteria by sitting in a box for a month. The filter for my older fish is a three part filter so he kept the sponge and biobag that was already in there.
I would love to bring the 10 gallon back to school with me but I'm afraid my own divided room doesn't have the desk space or stand space to properly hook up the tank. If I ever were to divide the 10 I would probably do 7 gallons and 3 gallons since Salem didn't take to the 5.5 gallon by himself very well. I do plan on bringing with me a second tank in case anything happens.
(Thanks for flipping the pictures)