I have wild-caught Ram, so I do use Seachem acid buffer to lower the Ph when I do water changes, I keep the ph around 6.5 ... works fine, and I use such a small amount of the buffer -- about 1/8 tspn -- that it lasts for years
that being said, I'm sure I could stop doing this gradually and the fish would adjust over time ...
that being said, I'm sure I could stop doing this gradually and the fish would adjust over time ...