i have a sultan, orange spot, red leopard and a rhino in my 90g african tank along with loaches and botias and they all get along and are growing nicely.
Personally I would'nt try any pleco just cause they need a diferent ph than africans, of course the're are some that can live with a higger ph but it would affect their healt, better get some synodontis, gold nugget plec's are too beautilful to risk their life...just my two cents
I have tried Sailfin n Royal Plecs with my comm... But my water is near to neutral n if ur PH is so high long term basis might not be a good idea as it may be determental to its health.... But if u realli need to put in one u should introduce it slowly to the high Ph to prevent possible shocks or death