which is why they are usually found at
great depths. Even the juveniles that
inhabit shallower areas are still found in
light levels under which humans would
need an alternate light source to live
comfortably for any length of time.
To help keep bigeyes more comfortable
and to provide cover for them to hide
in and under, try to keep the number of
watts (the strength) of the overhead lights
to a minimum. Unless you are keeping
corals or other photosynthetic animals,
there is little to no need for high-intensity
The glasseye snapper Heteropriacanthus cruentatus, commonly kept by hobbyists, is found in both
the Atlantic and Pacific Oceans.
are not pretty, but once they are covered
with live rock and hidden from view,
they work really well for providing a
safe, sturdy retreat for darkness-dwelling
critters like bigeyes.
Having big eyes would typically be
a good thing for a predator of the sea.
However, we hobbyists typically like to
illuminate our aquariums so we can see
into them, wherein lies a severe conflict
of interest. Bigeyes don’t like light and,
worse yet, it’s really not their decision.
They’re morphologically not adapted to
live in such highly illuminated habitats,
Filtration & Circulation
Due to the demands put on any system
when feeding frequently, the filtration
setup must be of superior quality and
have the ability to handle the heavy
bioload that results from the bigeye’s diet
of high-protein foods. Typically used in
these situations are large wet-dry filtration
systems that have a generously sized
sump where a large protein skimmer can
be incorporated into the overall system.
In addition to a good, strong filtration
system, efficient circulation of the