This is nothing new.
Why not try to fix the problem in a "safer" way than adding a carbon source. You are playing with fire. I have never dosed sugar myself but my brother had for years. He had tried it twice and both times, ended up with tank crashes. Long term, I think after about a year and a half, in one of his tanks, most corals began to get quite brown. I have read about why this happens when you dose sugar but I forget why. I think it was also most soft corals turning brown. IMO, adding a carbon source makes a tank very unstable over the long term. Why not just do things right, get the right equipment and forget dosing carbon all together! Add a refugium if your nitrates are high, get a better skimmer if your skimmer doesnt pull out thick brown skimmate, skim wet if needed, feed less, ect., ect.
Another interesting thing is, I read an article a while ago about how in a few spots in the caribbean, corals were bleaching from from waste being pumped into the ocean. Traced it back to very high simple sugars...same as what your putting in your tank. I think the levels were off the charts and nothing like what people are dosing but still doesnt make sense to add.
Personally, I think you need to find the source of the problem.
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