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Plants like guppy grass and duckweed will grow very well without any substrate at all and are just about impossible to kill. If fact, they will need pruning every few weeks.

Most mosses are also very hardy. Java fern grows well for most people, but for some it just doesn't do well.

You should have roughly about 2 watts per gallon of light.

You won't need any extra CO2 in any form.

There is nothing complicated about a soil substrate. Read the FAQ's here and also Ms. Walstad's book. In it she summarizes the principles and then delves into the science behind them. You won't have any trouble understanding it.

Lot's of luck!

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