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it looks like it's missing some of it's arms. I've seen ones like that in my LR.
Here's a pic of the other mini-stars that I've seen - but these are typically in my live sand.
The principle is basically the same as say an in-line chiller.
Water flows in from one side of the bucket - and exits the other. You'd probably want to secure a valve on each side into a bulkhead and then that way if you ever want to replace the DSB with a new fresh bucket - you could. You...
I think one point that should be made is that a display "DSB" is not just a "set it and forget it" kind of situation. Even a SB that is less than 2 inches is not maintenance free.
In Knopp's book on giant clams, he states that hobbyists occasionally stirring the sand (no different than if a...