get yourself some PH buffer like 7.6 or 7.0 and you also need to get the lock for whatever PH you prefer. You want to add it slow, once you hit the PH you prefer, lock it in with the PH lock. I forget the brand name, but honestly you'll get better color with a higher PH. If their doing well I would leave it alone. My water went alittle acidic, so their color is alittle bland but, I plan on raising it slow after my next water change. The more acidic the less color your going to get and their eyes will cloud. I'm around 6.8 right now, I need to bump it up abit, I prefer 7.2 to 7.6 but i've gotten lazy lately.

