Ah, I forgot about a little perspective.
The photo's from my 29g tank (not very big, in fact referred to as a "nano" tank by the reefing community).
The photograph depicts the area circled in red:
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Not very large, in fact, smaller than a dime. The "bugs" are about the size of a pin head. Yes, they're pretty much "fleas of the deep."
The yellow and gold striped thing is actually a branch of that coral close up - its more brownish in reality, but kinda fades with strong lighting and blends into the white of the coral skeleton.
Those frilly things on the end are the polyps - they can withdraw into the skeleton for protection. The polyps on this one is small, so its called a "Small Polyp Stony Coral" or SPS coral.
Here's a shot of one with the polyps out a bit further back (not the same coral):
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There's also Large Polyp Stony Corals, LPS like this hammer coral:
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Interceptor is dog heartworm medication (perscription only) - its in the trial stages in treating reef tanks and appears to be pretty effective so far.