I've had my betta in a new tank for 3 weeks now, in a planted Fluval Spec II. The betta is doing fine as I'm changing 1/3 water every day or every other day, but so far I haven't seen any rise in nitrite and the ammonia continues to be in the 2.0 range. Should have been enough time by now for the ammonia bacteria to colonize, no?
The thing is, the ph is on the very low end, as it barely registers up as 6.0, the lowest color in the API Master test kit. I've read somewhere that it may inhibit the growth of ammonia, and yet have seen many advice to not muck with the pH.
Any advice on what to try next? What's a safe way to bring the pH closer to the 7.0 range?