"The water (and the betta) was fine with weekly 30% changes, but now after 3 weeks, one of the plants died (I removed it though) and there now seems to be an extreme ammonia spike in the tank according to my API tests... the tests are reading between .5ppm and 1ppm (though it is hard to tell), and the tank smells awful, so I have been doing daily 40% changes starting 2 days ago, but I am afraid this is" . . . .