The nearly 90% of "sugar water" I find to be a real eye opener. Glad I gave away what little bit I had a long time ago.(Sample packs that came with 2 different aquariums).
In researching all this further, I found this:
http://www.tetra-fish.co.uk/tetraeasybalance/article3.pdf
It seems he would recommend it ...
He also mentions another product, "Tetra Nitrate Minus." Now, I am researching what is in it ...
Regards,
JS