Im changing to a single 1/2hp pump and Im not going to open the barracudas so they can be returned with no problem, im just out the shipping. I talked to the people at custom aquatic which is where etss sent me to get the pump, and they said running the two barracudas outlet to inlet of each other would increase the psi, but they would rather me just run a large single pump, it just kinda sucks going from only 450 watts to like 900, but theres no since in having a huge skimmer not skimming anything lol.