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U tube here too. When I switched to the enclosed one, I didn't like it. There was no way to clean the inside, creating more of a chance for a flooding problem. Once I hooked up the aqua lifter pump to it, I felt safer.
Add this switch to the same plug that turns on your top off and nothing else is needed.
Your pump is hard to start a siphon. If this switch is in line, it'll hold the water in the lines. It stays closed until you get power to it, then it opens.
http://www.autotopoff.com/solenoid/
Our Nikon Master is on Vacation right now.
I'm sure Phyl has all the answers you would need.
I've used macro tubes in the past (about $20 for a set of 4) and got great macro shots. I haven't had the chance yet to pick them up for my D40.