Marine sump is pretty much crawling with tiny life, snails and these things. They caught my attention because they are very active, scampering over the rocks and algae and are growing larger than all the other life in the sump. This one was about 5mm long in body, he was caught in this 50ml medicine cup and I'm afraid this was the best of the photos I got before letting him go again.
Ive got loads of these in my orca... (well did have)... They are great at scavenging as i found out when one of my stomatella slugs fell from the glass and they were all over the thing and the only thing left was a the shell..
Probs be a good idea to put a few into the display tank (can anyone confirm that)