Can This Be Safely Used For Bettas?

The key word is "safely", and I personally wouldn't use it. Nothing beats clean water.
 
Yea better be on the safe side and dont use it.
 
I would also say no, just because in the description it says "Do not use in aquariums with low oxygen conditions; aeration with an airstone is highly recommended. " and I know all of my smaller tanks do not have airstones, as my fish hate them. ^_^
 

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