Ok so i am getting a green terror and some plecos for my 55g. I have two aquaclear 110s, but i feel that those filters are too simple, i need something that i can screw around with

Here is my plan:
( i copied the idea from someone else but vamped some of the stuff up )
I am very open to criticism and advice, post your own ideas, videos, plans and so on.
Ok now for the questions:
How many gallons should the tank be?
How many GPH? my 2 aquaclears are 500GPH EA.
Should i put the heater in the sump or in the tank?
Is a sump loud? is a good sump loud? what makes a sump loud?
Thanks a lot

Here is my plan:
I am very open to criticism and advice, post your own ideas, videos, plans and so on.
Ok now for the questions:
How many gallons should the tank be?
How many GPH? my 2 aquaclears are 500GPH EA.
Should i put the heater in the sump or in the tank?
Is a sump loud? is a good sump loud? what makes a sump loud?
Thanks a lot