My fully-grown Geophagus Tapajos orange heads (7 years old) are slowly picking off my rummynose tetras. The rummynoses were introduced a couple of weeks ago and look fantastic in the tank but their numbers are dwindling as the Geophagus see them as targets/dessert. The tank is ‘scaped with sand substrate, driftwood and hardy plants (Anubias’s, Java Fern, Anacharis, etc.)
What’s another shoaling/schooling fish (preferably of South American origin) that would be safe from my Geos?