I have 2 ac110s on my 125 as of right now and the oldest one is due for a cleaning...my question is my newest one has been on there for about 2 months and pretty sure its built up enough bb but do i just take off my old ac110 and clean it and leave the other runnin and my tank be fine? and how do yall go about cleaning them? my foam media is ready to be changed so should i just change it or rinse it or what....last time i just rinsed it in my tank and my tank looked like a freaking river!!!