80 gallon setup

[scuglass]

does this setup look like it will be sufficient i have a few questions

1.i am thinking of using a mag 12 as a return pump will this be appropriate circulation wise. how think pipe will i need to use to get max flow with minimal air bubles

2.will the over flows i have planed work will there be a siphon created?

3. if not where in calgary can i get a tank drilled, where can i locate bulk heads, and what thickness shouuld the holes and bulk heads be

4. if i have a filter will i need the bio balls or if i use the bio balls will i need a filter?

5. what would be the best choices for me to put in the fuge