Hmmmm Ok so it's FW but I think my next reef tank will be like this

[Funky_Fish14]

I wouldnt think there would be much if any waterflow through something like that, thus you'd have a hard time changing the water in there. I mean I understand the fish swim through it but they wouldnt displace enough water to get the nutrients out. Fish can poop up in there too. Also, a waterchange would prove difficult because you cant go beyond the bottom of the tube, haha.

Definetly a cool technical challenge nontheless!

Chris