Once a year, I used to get a parade of parents (moms) with kids trailing
behind them, ready to buy some fish and plants to put into a sealed jar
for their class science experiment. It was an annual event for us,
talking them out of putting several Guppies into a 1 litre jar. I
usually send them off with a variety of plant cuttings, a newborn fry or
shrimp (which they can return to me after the experiment is over), and
instructions to use a larger container, keep it away from heat sources,
etc etc. For the most part, the parents where quite sympathetic and
willing to follow the instructions, so I'd like to think that the
greatest influence on our moral compass is knowledge ).

Sure, it's really not hard to do. I once had a tank with a colony
of Aphyosemion bitaeniatum in a 20 gallon tank - I started
with 6 pair and a lot of thread algae. The tank was extremely
tightly covered (they jump!) and evaporation was near or at
zero. For about 18 months I did not feed them. Fish came and went,
occasionally you'r see a dead body (not for long) and occasionally
you'd see fry. There were always about 6 pair, more or less.

The liight (strong) kept the algae going, infusoria and copepods
lived off the algae and the fish ate them. Fish waste kept the
alage growing.

I was away for two weeks, the light had failed and when I got back
everyting in the tank was dead.
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