I have moved and merged your posts as they are more relavent to this forum and each other.
So without knowing your head calculation, let's go with a standard 6' head and assume the GPH
from the return pump is about 750 GPH
. To bring the total GPH
up to a better standard for a reef tank you should look into either more than two PH
's or stronger ones to reduce the amount of equipment in the tank. You would probabley be better going with a Maxi jet 900 or 1200. It will really depend on the types on animals you will end up keeping as some prefer more flow than others. Either way, your total GPH
(water movement) should be closer to a minimum of 1000 GPH
excluding the skimmer pump.