I have two betta fisghting fish. One of them has siddenly got whiteing gills and has been acting strangley like heavily breathing and staying at the bottom of the tank then rushing to the top of the tank. However i doubt its ammoina poisioning as my other betta would be acting in the same way. This tank has been established for about 2 months now. The ill betta has been in the tank for about 3 weeks. Any advice on what i should do. Thanks
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