Dither fish that fit?

[BassetsForBrown]

Hi,
90g with 1 fully grown long fin Oscar, 1 fully grown Blue Acara.

I want to add some non-cichlid people to tank. (No pleccos)

 

[BassetsForBrown]

Also, the current two cichlids spend most of their time around the middle/bottom, so it'd be nice to have something that likes to swim on the top.

 

[Achilles1763]

Humm full grown oscar (what size my I ask)
And a full grown acara mean you are the top end of your stocking for a 90g as it is. Further more any small dithers, less than 4 inches, would immediately become a meal for the oscar! You could maybe solve the issue with more vertical decor and maybe feeding floating pellets... this should get the oscar more active and up to the surface. Mine cruises the middle and upper tank all day scanning the surface for food.