Honestly you want to have near 10x flow in your tank depending on the gallons or litters, probably better off using 2 koralia nano's I wish I had of one on ea end of the tank, what size is your tank, also tip on the heater most heaters now a days have a safe set limit means they don't go over 78 F in temp find one that don't have that feature. Something like stealth or stanless steel external controllers work well but costly