What are some cheap tank mates for 2 large female African clawed frogs?

These are not african dwarf frogs but africain clawed frogs.

Frogs are 6 inches

Pleco in tank is 7 inches
Update: Tank is 30 gallons.

When I first got the frogs I put them in with my community fish lank and they ate all of my fish except one platy in one night! :(
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