Great pics, I have one of the little red eye'd guys in my sump. He was found pretty tiny in my 24g aquapod (about a year after anything new was added none the less) and has grown substantially since moving into my sump. Never caused any damage I know of in my aquapod while he was in there, and an interesting side note I added some halmidia to my sump and within days it was GONE, I'm assuming he ate it since it was looking perfectly healthy. Cheato he doesn't seem to bother (at least not enough that I notice) so I'm leaning to thinking he's a algae eater although he sure looks menacing.