As with all toxins the amount of sugar added to your tank is also important.
1. At an (unknown) minimal level -- unless you want to experiment, probably nothing will happen -- the bacterial populations will handle the sugar without causing a significant change in water chemistry.
2. An increasing amount may cause a significant pH drop and/or ethanol toxicosis for your fish which could lead to drunkeness and/or death. Sugar when completely broken down does become carbon dioxide and water. The problem is the intermediate products that will get into the water during the fermentation process which could include lactic acid and/or ethanol. The amount and types of acids produced depends on how the bacterial populations typically present in a fish tank would handle the sugar. I have no idea what byproducts would result and in what quantity, but most of them are acids. The more sugar added, the more acid produced.
3. A very large amount of sugar would kill all the bacteria, fish, and plants, and basically make a fish tank syrup. Sugar is an osmotic and will draw all the water out of the bacterial cells, as well as the fish and plants. They will all die of dehydration and your tank will be sterilized.
(Πηγή : http://www.aquaticplantcentral.com/f...ium-water.html)
....put some extra aeration in, and do a few more water changes. should be fine.
....all i did was do a 40% water change on day and done another 40% on the second day and all the fish was fine and no problems so far
(Πηγή : http://www.fishforums.net/index.php?...&#entry2164505)
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