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This has appeared near the filter in my 5 gallon Betta tank and I was wondering if it was a bubble nest or something wrong with the filter. The filter has a really slow filter output. It seemed to appear after I put a capatta leaf in the tank.
Some Bettas produce bigger bubble nests than others, BUT to be on the safe side, check your water parameters. If everything is OK, I wouldn't worry about it. I have a Blue Gourami that creates excessive bubble nests.