I have tried to find out what the shell is that this fangblenny (Adelotremus leptus) often uses for protection. The 2012 paper describing the fish species referred to it as a calcareus polychaete tube but I can't find examples of it, and perhaps it is something quite different. They were found in 5-10m depth in the silty central area of Marsa Abu Dabbab (Marsa Alam region). I have also found small hermit crabs using them (tiny crab for such a long shell looked really funny).
Any help is appreciated, Bart
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