I currently have two of the large coop sponge filters running in my 55 gallon community tank. Have a mix of species, guppies, panda corys, hillstream loaches, cherry shrimp, and four otos. I have a fluval HOB filter running as well that I added to clean up the water a bit. I am looking to remove the HOB filter, but I am worried about losing bacteria. It has not been running the entire time the aquarium has been setup(we are going into year 3 of the tank being up). If I remove the HOB filter am I going to crash the tank??