Jim I have been thinking about your tank question.
I did not build this house. One thing that has caused me quite a bit of grief is drainage. Both my SW tank and indoor pond have overflowed at least once. In a finished basement that is a bad thing.
If I was building from scratch I would have an integeral drain as part of the tank. I also would have a 2-4" recess in the floor around the tank to catch water. Essentially I would design it so that if the tank failed, most of the water would be captured in the recess and drained away. This also has the added advantage of allowing for taller stuff under your tank...like skimers and the like. I would also have a water line in the floor to deliver water to the tank. This line could go to a utility room and connect to an RODI unit...or it could go to a tank of saltwater that you use for water changes. If you plan it right you would never have to lift any water...run hoses... It is so easy to put in when you are building the house .... but after is very dificult.
As resale is also a consideration, you can fill in dips in the floor if need be.
This is likely the most boring answer ever...but us engineers are kinda that way
