Hello! I currently have two tanks set up, an established 10 gallon and a 15 gallon I set up a few days ago. I'm really eager to move some of my fish over to my new aquarium, but I obviously want to make sure it's cycled first. I know you can take out the filter media and move it to the new tank's filter, but I have some problems with that. 1) I'm keeping both tanks set up. Don't I need to keep that filter media in my old filter to keep my cycle there? 2) I barely know what that means. How do I move filter media? What's the "media" part of the filter? I know that's a really dumb question, but I'm super new to all of this. I wasn't the one who set up my 10 gallon, and I'm just now starting to maintain it on my own. (Like any good college student, my mom used to do that But she doesn't know much about cycling aquariums either, so she's not sure how to help with this.) I didn't buy the old filter, or even the filter for the new tank. We got that one at a yard sale. So I'm not sure what kind of filter it is. Any help would be really appreciated! Here are some pictures of my filters! Filter on the old tank (10 gallon) Filter on the new tank (15 gallon) (Sorry those last two pictures are bad, the top of my aquarium sits up too high for me to get a good picture) Basically, what do I take out from the old filter and where do I put it?