Jan writes:
Most of the freshwater invertebrates that have the greatest functional value
in a sandbed would not be as showy as aquatic insects. Aquatic segmented
worms (naidids, tubificids,and especially lumbriculids) would keep the sand
stirred but you may never see them. Ditto the meiofaunal groups (e.g.,
naidids, rotifers, harpacticoid copepods) which would take care of the
detrital recycling. These can be collected from almost any kind of habitat
with sandy bottoms. The other possibility is to collect the drip water from
potted plants in sandy soil.
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