I think your ph is fine. However if you had to modify it to get it there, don't bother. The fish are most likely accustomed to your water type.
Have you cycled your tank? Adding ammonia checking ammonia, nitrite and nitrate levels?
If you have no clue what I'm talking about, then it is probally a good idea to head over to the beginners section and look at the pinned links at the top of the page. Read up on the basics and you won't regret it.
