Isopod ID?

[ReefTourist]

I have a newly setup 90g system, w/ only a few snails, hermit crabs, and an emerald crab in there at the moment (no fish).
Last night I purchased my first fish which is in my quarantine tank now. While I was acclimating some coral that I also bought I noticed this bug on the glass in my display eating algae:

Can you ID it, is it the "bad" kind, and what steps do I take to get rid of it (if needed)?

The eyes are really small, has antanae, legs, was definitely eating algae off the glass, and it looks like it may have "tail appendages", or at least 2 longer rear legs, like the Sphaeromatids in the Cirolanid/Sphaeromatids comparison picture here

 

[DJ88©]

[moved]

 

[ReefTourist]

(Thanks DJ88)
Comparing my mental images and the one I've posted to the old thread here I'm feeling more confident that it's the benign type. Hopefully I'll see it again today, and see if I can get it to roll into a ball....
I thought that they should be mostly nocturnal? This one was up on the glass at "sunset" while my actinics were on and I was acclimating some coral. It was there for a long while, and if I had posted/searched earlier I would have tried to capture it.

I'd still like some input to ease my mind (or turn me into an insane cirolanid hunter).

 

[ReefTourist]

Another thread with something VERY similar to mine that is harmless:
http://reefcentral.com/forums/printthread.php?threadid=551596&perpage=25&pagenumber=4
(search for isopod)

 

[capncapo]

Definitely a male sphaeromatid isopod. Harmless.

 

[graveyardworm]

Here's an article.

edit: sorry just noticed you already got that one.

 

[ReefTourist]

Yes, it's a sphaeromatid!
Much research was leading me that direction, but I got lucky when I got home: There was one on the back glass of the tank (while lights were on).
I used a specimen container to nab him, and get a nice close look. Here are the best zoomed in pictures I could take. I really should invest in a nice macro lens.

And this confirms it even more - it rolls into a ball.