would it be abled to be baffled/turned down enough for an 8x8x8 tank?
Our PSE-1 is 12 inches long. The PF40 is also too big; actually all of our PFUV series are too big with the exception of the PF15 which is 7.75 inches wide, but for a 2.2 gallon tank, UV sterilization should not be needed at all. The tank should have weekly water changes. We recommend the PFE-1 which is only 3.25 inches wide and can be dialed down to have a nice safe flow for the tank and offer plenty of filtration capacity.