multiple breeding tank set-up

[cichlidman878]

hi guys for the ones following my other posts i am building a fish house for my mbuna and peacocks.

i will be using 3ft tanks ( 110 ltrs ) approx 20gallon long for you us folks.

and im not too sure what size pvc i should use for the drains options at my local hardware shop is either 3/4'' or 1 3/4'' or bigger. i will be running 2 tanks to each sump and my return pumps are 5000lph and are adjustable.

any help would be greatful

thanks