I am buying a 120 gallon setup off a guy on craigslist I like everything i have seen about it and have no reservations. However I am not familiar with eheim filters and more particularly thermofilters. I don't know how comfortable I am with a filter heater. Anyone with past experience with these good or bad please chim in. I am still going to get the set up but might start looking for a filter replacement sooner rather than later.