i had lady at the fish store checked my water ph is really high was wanting to get this oscar from pet land he is about 8in and in a 30 with a big red devil that oscar is just getting beat up what can i do to bring him home and put him in my 75
Agreed with all. pH doesn't matter. What fish feel is the kh and gh, not pH. Oscars are captive bred in water from all extremes. Mine are in hard water (kh 14 gh 300) and have real good color and are super healthy. People worry too much about pH and not enough about keeping nitrates low with Oscars, IMO.
The best move would be to check what PH the fish is being kept at NOW and slowly acclimate it to your ph. While fish can live in many variations of ph, a large swing done too quickly will kill them.
I had the oppiste problem very low pH from r/o Water by low I mean less then 6.0, added some live rock and now ph is rising slowly so far its at about 8.0 and the fish seem happy, been doing bigger water changes to keep nitrates at 20 or below.