not sure about these, colonial, each polyp about 2cm long, bright white features
Unusual shrimp with guild sign tail markings suggestive of cleaner host status
All 3 images are of the only one I've ever seen.
*NB:Update on 10-11-2018:-- I had actually seen at least one Tozeuma elongatum before this,which however I submitted to iNat only yesterday i.e.the 9th Nov 2018,even though that observation was on 31st March 2015, @ Normanville just off the beach slightly north of jetty. I only realised a few days ago there were Tozeuma elongatum shrimps cleaning a Pugnose Pipefish (which was my intended photographic subject on that 31-03-2015 dive) when reviewing and cropping more images from that dive☺.
Returning to the current observation, I had already posted my single best Tozeuma elongatum photo from Rapid Bay a few months ago ,but as I am very interested in temperate cleaner species I'm now including 2 less sharp (and with incomplete views) pics ,for the record.
Rather poor natural light images ,some cropped to assist viewers,of a slender long green shrimp on a Little Fan Bryozoan. Probably using it as a cleaning station,given this temperate seagrass-inhabiting shrimp clearly displays certain key features of host cleaners[which are better seen on (e.g.) my pics of this species from Rapid Bay,elsewhere on iNat]
Young ones were common in the shallow subtidal section of the jetty on this MLSSA dive but uncommon on my dive there next day (I guess the incoming tide later in the 2nd day was a factor:-perhaps they move to slightly deeper water to forage on rising tides?)