eleocichla and Retroculus are
two cichlid genera that share a number
of common traits, but one in particular
distinguishes them from other cichlids. The
very first thing any observer is sure to notice is their
somewhat clumsy way of swimming. The fish hover in the
water column for a few moments, just hanging there, and then sink
to the bottom like a stone. Most fish swim smoothly and effortlessly,
but locomotion seems to be difficult for Teleocichla and Retroculus.
Their characteristically awkward swimming style is an adaptation
to the environment in which they live in the wild, typically brisk,
fast-flowing streams—an environment that caused a reduction of the
swim bladder over time in these cichlids.
The author’s Retroculus setup includes plenty of
rockwork and Anubias.