Well, I wouldn't pin a label on these guys and submit them to my graduate prfessor either, but they are not amphipods, the cleaners definitely had big wads of eggs under their swimmerets, one night there was a blizzard of small fry in the tank looking like little shrimp, and their eyes glow in the light of the LED, just like the cleaners. Their body shape is even more like the shrimp now and they dart rapidly among the rocks, in a motion not like the amphipods. Short of dissecting one of them....and of course they'd be harder to catch and remove than that blasted
blue damsel I've got.
If no one else has experienced them, I'll be suspicious of my i.d., but time will also tell.