Air pump for multi tank

[aandvfarm]

Building a tank rack with 4 20L on top and 2 40B and a 75 on bottom. Prob a total of 10-12 sponge filters. I need a pump that will run all these. I may canister the 75 but just in case. Also I know there's some science in the placement of the pump + depth and all that if anyone's got any ideas. The bottom row placement is 40. 75. 40.

[dalto]

I would probably get a small linear pump for that many sponges. An Alita or something similar.