Thanks Dan , I have a couple ""hob'' filters I keep for incase . I have and am currently switching over to in tank filters . I really like the new tetra whisper in tank models . Hade and have the old hob whispers to , in my community tank in the den I have one of both lol in the same tank on either side . Gonna get another in tank whisper though this weekend I didnt wanna change both filters out at the same time I was scared it would have thrown my tank into a new cycle . So I replaced one last week and doin the other next week .