Thanks everyone! Yeah I wish I could go as big as possible to cut down future cost but I'm working with some space restraint right now so the 55 will have to do. And I'll definitely check out Joey's videos, I've seen them before but will have to go check them ou again.
Also, I actually have a bunch of the k1, and k3 caldness medias (several gallons). Are those fine to use for a wet/dry sump even though they are mainly associated with fluidized filters?