Hey here's how I run my Equipment setup
Im using 2main canister on either side & create the dropdown waterfall effect frm e top of e tank as I like the splashing sound of it and it creates more air bubbles+oxygen
While the internal filters in e middle gives the middle part of the tank some directional 2way flow when it hits the front on the tank...
lastly the 2Gex japanese brand airpump filters further clean up loose particles which a normal airstone cant achieve
*recently removed my river gravels and trying out bare bottom