so i was about to start a chemi clean treatment and i realized that when i went to get the air pump and ston there are several kins rated for tank size if i have a 75 gal do i need to get an air pump that will support a 75 gal tank?? is there a way to use a power head that way i can get somecontinued use out of it rathe than buying an air pump i hope to never need again