They should do ok in high ph as long as they are acclimatized(sp?) to it. Mine are in ph 7.8 and are happy.
They don't eat green spot algae though, I have 3 BN pleco in one tank and 1 in another and still have green spot algae problems in the tanks. The do however do a gereat job on brown algae and soft green algaes. I have yet to find any fish that will eat green spot algae and i have tried many(SAE,BN pleco,Clown pleco, otos,algae shrimp,zebra snails, other snails, rubbernose pleco). I good magnet scrapper or razor blade is your best bet for green spot algae.
