You mentioned an urchin as a clean up crew at the start of the post. Looks like it's no longer on your list. I wanted to mention we bought a black spiney urchin and it's grown very large, very fast (10" diameter now including spikes). It also drops a tonne of feces which will collect on the bottom of your tank (looks like little sand pebbles, actually adds a nice look to a bare bottom tank) =|:-).
I love having it in the tank - but it's now become one of the main centerpieces of the tank due to it's size.
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