I am new to the hobby and getting myself confused on pumps. I understand the gph need for certain tank sizes, thanks to Joey's vids. I am gathering supplies to build the vertical canister pump, from Joey's YT builds, for a 10 gallon as a test run for a 30 gallon in the very near future. I am looking for suggestions on pump type and brands that you guys think would be sufficient. I'd like to set it up so I can use the pump to double for a gravel vacuum pump as well. Every aquarium store I go to stumbles when I explain I'm making my own filter. For some reason they just don't understand or know what I need.

Any opinion and personal experience with certains are most welcome.