Third - Make sure every corner is ok, and that all you need is there! ( Such as the tops )
Fourth - Make sure you clean it real tidy, and ensure it has no leaks as it is!
Later I´ll try and insert some videos I made of the process!
Hope You enjoy!
Part 1 - https://steemit.com/aquarium/@hugohenrique/how-to-internal-sump-for-turtle-aquarium-pt-1
Part 2 Video! - https://steemit.com/life/@hugohenrique/how-to-sump-on-turtle-aquarium-pt-2-video