#ed_op#DIV#ed_cl#I do really understand what you mean by drop to all the reactors. The pump will feed the manifold, out of the 8 outlets from the manifold I want to feed the tank the skimmer the reactors.Nothing will be gravity fed from the drains coming out of the tank. My system will have 2 100gl sumps one is where the hammerhead will pull from and the fuge will dump into. The second is where the reactors and the skimmer will pull from and the tank will drain to.Then the 150gl fuge will will overflow and gravity back to the first sump and feed the tank. I did this so I could spare sopme pods from being pulled through the reactors and skimmer. Also with the second sump being elevated the only one to show evaperation is the sump where the hammerhead will pull from. This where the top valve are located also where I will do water changes from. Wjat did you mean by "stall" The pump is designed where you can hook up a valve and throttle back the pump to meet your needs. Thenyou don't have to worry about stress on your pump. I will also be adding two 60gl grow out tanks later. That is why I went with such a large pump. I have a pump room behind the wall of the aquarium. So please explain the back pressure and the stalling you refferd to. THANKS GOZYK#ed_op#/DIV#ed_cl#