It could just be your water, but I wouldn't really trust anything but a liquid test kit. Strip tests etc tend to change according to environmental factors, so can be a bit off.
I would also caution against using BettaFix. There are some risks associated with it, that, for me, make it not worth the risk, and really, it won't do anything that clean warm water won't do.
I'd also advise against pH adjusters. It is better to have a pH that is slightly too high than one that changes.
I would also caution against using BettaFix. There are some risks associated with it, that, for me, make it not worth the risk, and really, it won't do anything that clean warm water won't do.
I'd also advise against pH adjusters. It is better to have a pH that is slightly too high than one that changes.