This angelfish, like the Purple Moon Angelfish, is also strongly
recommended for the recent beginner who wishes to try his hand at something a little more
demanding than damselfishes. This angelfish comes mostly from the reefs around Ceylon, and
will often commence feeding in the aquarium within twenty-four hours of its introduction.
As with almost all the more delicate reef fishes, that is the butterfly fishes,
surgeons, tangs, sweetlips, wrasses, etc., the angelfishes do not feel at all happy if
placed into 100 percent fresh synthetic sea water. For this reason, it is much better to
place them in an aquarium which has previously contained less demanding fishes for a month
or so. This means that the water has had time to mature and that the gravel overlying the
filter plate will contain a significant population of nitrifying bacteria, ensuring that
both excreted ammonia and nitrites are rapidly and safely metabolised to harmless
nitrites. If this is done, the newly introduced coral fishes will never have to tolerate a
dangerous concentration of toxic ammonia and nitrites. The exceptions to this rule are of
course the Caribbean angelfishes previously referred to. Because of their susceptibility
to Lymphocystis viruses, it would be better to place them in a solution of one of the
pre-aged synthetic salt formulae such as Natura sea salt.