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
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No more tanks  - Laying off the ReefCrack for awhile!
Cheers,
Chris
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