I used the cal at reefcentral. From base to top of tank is 4ft, od of tube is 3/4", the squid loss is 20% (which is equal to [2] 90 degree elbows, then 3ft of horizontal tube to reach both ends of tank, (2) 90's to turn into tank and then (2) ball socket nozzles. That equals 11ft of loss, the...