I have a marineland 93 cube that was purchased used from a store that recently closed. It was set up for freshwater and doesn't have an overflow system with it. I've been humming and hawing over which style to place and have a hard time deciding. From what I've seen most people have a corner overflow built in. I like the idea of the pipes going straight down to the sump while keeping the outside of the tank clean, but I'm not a fan of the lost space in the tank. I have yet to see anyone with an external overflow mounted though, something more along the lines of the synergy ghost overflow. Are there any cube tanks here that have that I haven't found yet? I would like to also hear people's opinions on one versus the other, maybe it'll make the decision easier for me. Thanks!