i also have fish that cause no PE so i try to aim for stuff that just has pretty base color. some already mentioned like oregon tort, green slimer, hawkins
smoothskins in general are great. i have a few of those and the lack of PE doesn't hurt their looks at all, honestly they seem like the ideal angel/butterfly tank acro along with torts. with the lack of PE, it seems like my fish don't even bother nipping at them
anacroporas seem to do well and don't mind the lack of pe
others that just look generally good: pc rainbow, garf bonsai, av99 blue monster, cali tort, tsa fruity pebbles, arc fireworks, tanzenite terror, tgc orange creamsicle, garretts acropolis muppets, cc dark knight, ora pearlberry, boomberry, ora red planet, ora green planet, jf fox flame, bc bubblebath unicorn, purple stylo, red monti cap, green birdsnest
some that don't look very good: rr pink cadillac, without the purple polyps it's pretty uggo. digis are quite ugly, i have bubblegum, forest fire, and german blue polyp and without PE, i'd definitely rather have anacroporas or birdsnest/stylos in their place. i have a few green acros with purple polyp types like upscales microclados and katrapora that aren't ugly, but without the PE they're pretty samey with other green acros. rr the vinh is another that looks cool enough, but the bright purple polyps are certainly missing so it's just a creamy white acro