You have to be careful about playing with the pH. There is a range that many fish can adjust to, but the extremes can be tough. If your pH is 8, I would certainly try to keep fish that prefer between 7-8.
As a side note - the reason it's nice to know someone's location is because advice can differ by region. "why do you care" is cute, but, I can't tell you how many times I've seen an OP post a question and receive a whole slough of responses, only to find out that the OP lives overseas rendering the advice that people took time from their day to provide irrelevant. Your country is all that's really needed.
125 - BGK, chanchito cichlid, pictus cats, silver dollars, palmas bichir
125 - cichlids (severums, bolivian rams, chocolate), rainbows ( turquoise, red), loaches (angelicus, zebra, kuhli and horseface), plecos (BN, RL and clown), denison barbs, tiretrack eel, pearl gouramis, betta
90 - Congo tetras, african knife, upside down cats, spotted ctenopoma, kribensis, delhezzi bichir
2.5 - betta