Thanks for the input josk1. Have heard those all in one fluids can cause a build on the blocks ? you used them had any problems? Had not thought of vertical mounting the drives good idea thank you very much. As to the drain port it will drain all the fluid except for the pump as it lower than the res but with a little tilting will be a lot easier than pulling a tube that drain valve leeds to a drain plug at front of tower. Nice and easy and no spill so the plan goes