silly

West coast
Geelong
Sydney
Adelaide

Thanks guys, great info there.. I think I have a good start now.
I'll look for a ~4000l/ph pump with a bit of head for the output of the return filter. Hope I can get 16mm outlet for the return pump which should give me enough drainage with the 20mm bulkhead?
Also I Just have the single Bulkheads for the drain so I will have to create an inlet to go above the sides of the tank. I do like the idea of flexible tubing for the drains tho, I'm a bit restricted with access to back of the tank so flexible drains suit me. I take it will be the black anti kink tubing? Where do I get that from at a decent price? Heard it can be pretty pricey..

As for the reasons why I've gone the rack and sump route is i already have quite a few divided and single tanks with individual heaters and sponge filters.. Was trying to reduce the power with the amount of heaters in the room so thought the sump option would be good. I can also ensure maximum filtration effectiveness with the sump in the form of jap mat, k1 and ceramic tubes.. I have a couple of 300w Eheim lying around I was going to utilise in the rack too. I guess heating the room is another option but I am looking at high 28-30 temperatures for L numbers etc.. Not sure a room heater would be more cost effective?
Cheers