Thank you for the feedback. I was thinking of either using the two pumps in sequence or having each with a dedicated input and output line so that any clogs can be avoided as well. I know that I would need twice the PVC for this but its not that much more in the grand scheme of things.
goetzc - thank you for the input. I do not trust check valves as I have heard almost nothing but bad things about them. The flow from the second pump should keep water from draining back through the return line but I am not prepared to take that risk. Please let me know if you have any further ideas.
jnarowe - thanks for the reference to the sequence website. I have never run pumps in sequence but like the idea. I am refering to the last diagram on the page.
http://www.mdminc.com/Multiple_Pump_Curve.htm
I am assuming that if one pump fails, the other can still run without problems. I also assume that the second pump simply increases the flow and pressure output by the first pump. Please correct me if I am wrong.
The reason why I am considering a second pump running in the system is that I am not at home as often as I would like and I could like to make this tank as fool proof and moran resistant as possible, eventhough I am sure I will run into problems left and right anyways. I figure that two smaller pumps will also not use significantly more energy then one large pump, at least not significant after comparing the entire tanks energy usage.
I like the refrence to boating, I was thinking along the same lines.
erics3000 - Yeah this tank is going to break the bank. Don't even have kids but I am already burning through their college fund. Still working on the list but I will list what I have now as a starting point.
-1 Clown tang
-1 Sailfin tang
-1 Cole tang
-1 Regal Blue tang
-1 Neon Dottyback
-1 Mandarin
-3 Clown fish
-3 Chromis (not going back in the main tank)
-1 Firefish
-2 Bangaii Cardinals
Open to any ideas, I know that a trigger is at the top of my list. I would also like to try my hand at some angelfish. I had a juvenile emperor fish when I first started out and loved it. I am also partial to the sohal tang.