I know I'm probably making this harder for myself I just want my tank back to normal. I had been thinking of adding another filter for awhile as my sister who has a 100 tank set up for years told me she had a ugf with another filter and hasn't had any problems. I guest I just want to know if it would do more harm than good having two filters as I think it would ease my mind to not have to worry about it as much if having two filters would help.