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I echo the "no" to the idea of using sugar as a carbon source. Don't even think of it.

In a NPT the carbon is supplied by the atmosphere plus the natural decomposition that takes place in the soil substrate. It is not necessary to add it in another form.

Good luck.

Bill is right. Sugar is like adding gasoline to a slow-burning fire.

I added sugar to one tank about 20 years ago, and it killed a couple fish that night.

Just add more fish and/or snails and fishfood to the tank. Fishfood and soil organic matter releases carbon dioxide (and other plant nutrients) slowly and safely into the tank (my book, pp 78-82).
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