Okay, i think i just did the stupidest thing ever... WOW! I just recently bought a used fx5. Now before filtrating my tank, I tried my best to wash it thoroughly. When I thought it was and turned it on in my tank......a cloud of brown particles (probably the previous tank's fish waste) covered my entire tank! I freaking panic and did a water test but the water was about 31 ppm, around 7 pH, but should I be worried? plus when I do a water change tomorrow in the afternoon and turn off my fx5, is it going to do the same crap when i turn it back on? What should I do before turning it on after the wc? should i run it in the tub for a bit? Please any advice from fx5 owners will be EXTREMELY HELPFUL! PLEASE AND THANKS IN ADVANCE! F1 or ballinoutofcontrol, I need your help ASAP!