Bubble nests can look like anything from a few strings of tiny bubbles to a mound of them. Bubble nests aren't anything extordinary, they just mean your betta is mentally and physically healthy enough to breed. While it can mean that, many people take it that there bettas are happy and healthy. However, lack of bubble nests aren't to be taken as bad per say. Some bettas just don't blow bubble nests. Also, sometimes bubble nests are destroyed in tanks if the filter is too strong, or the air is too dry.
What is this? O_____O
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too strong currents can stress your betta and if he has long fins, potentially cause him to bite it off in an attempt to reduce drag. If you have a filter, make sure it isn't too strong and there are places for your betta to get away from the current. If there isn't, I'd advise baffling your filter 
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