It is highly recommend that you stay away from Freeze-dried foods because of their tendency to cause constipation/bloat problems.
First off, freeze-dried bloodworms are not an appropriate staple food. Definitely switch to a high quality Betta specific pellet like New Life Spectrum Betta Formula or Omega One Betta Buffet Pellets and toss out the freeze-dried bloodworms. Both of the pelleted foods I mentioned are available at Petco.
Secondly, a 100% WC once a week is not enough for a 1/2 gallon. Every 2 days would be more appropriate for something so small. I highly recommend you upgrade to at least a 2.5 gallon, that way you will only need to do water changes twice a week.
Does she look bloated at all? It sounds like a Swim Bladder problem, which is not contagious and be be brought on by overfeeding, also possibility the freeze-dried bloodworms. Keep her water level low so it isn't as difficult to get air. Try feeding a more balanced diet (the brands I suggested) and hopefully she will improve.
First off, freeze-dried bloodworms are not an appropriate staple food. Definitely switch to a high quality Betta specific pellet like New Life Spectrum Betta Formula or Omega One Betta Buffet Pellets and toss out the freeze-dried bloodworms. Both of the pelleted foods I mentioned are available at Petco.
Secondly, a 100% WC once a week is not enough for a 1/2 gallon. Every 2 days would be more appropriate for something so small. I highly recommend you upgrade to at least a 2.5 gallon, that way you will only need to do water changes twice a week.
Does she look bloated at all? It sounds like a Swim Bladder problem, which is not contagious and be be brought on by overfeeding, also possibility the freeze-dried bloodworms. Keep her water level low so it isn't as difficult to get air. Try feeding a more balanced diet (the brands I suggested) and hopefully she will improve.