David,
Triangularis seems to be more habitat than depth related. In my experience,
it is found in coarse sandy areas with lots of coral rubble. That list of
specimens I relayed to you represented probably 200+ dives per year over a
15 year span. Juveniles, which still the chalky white intracalyx, are much
easier to see than more mature specimens which get a bit of growth on them.
Finding those is almost an accident when they are well camouflaged.
Wayne
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