Since there are a ton of options and knowledge online and out there, what size of a sump would you recommend it for someone just getting into the game, and why would you recommend that size?
For me, I'd personally recommend a sump size of 55 gallons, since it not only has a lot of room in order to grow your filter media size - but also has a lot of water volume room to make sure that it's that much harder to make a mistake water parameter-wise at once.