20g long sump

I’m gonna be setting up a 65g with a 20 long as a sump using the fiji cube diy kit sold on BRS. When it comes time for a skimmer after cycling, what should I go with?

I have been waiting for my house to be finished, and my wife and I have been shacking up with the parents. I've been making fun of millennials still living with their parents and here we've been doing it for two months now. So, hopefully in the next two weeks, we'll be out. We have the house...