>>Peat filtering seems to be more effective. What does the rest of the group think?<< And what techniques are used? I have an Emporer 280 OPF that has an extra cartridge where I can put in peat. Has anyone used this set up before? And how much peat should be used (I have a 29 gallon tank)? Bill Vannerson McHenry, IL USA http://ourworld.compuserve.com/homepages/William_Vannerson (updated 10/21/97)