Hi Ryan !!
Congrats on your new position !!
How about cherry shrimp ? easy to culture, and the subadults would be perfect food for firemouths !
All you'd need would be a 10g tank with sponge filter and small heater... less messy to culture than other foods. Plus they will provide behavioral enrichment for the firemouths by making them forage for food

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Rich_______
Part-time fishguy at Uncle Ned's Fish Factory (saturdays)
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Species I am currently keeping/breeding include :
Copadichromis borleyi "redfin"
Labidochromis caeruleus yellow labs
Aulonocara sp. "Lwanda"
Ancistrus cf. cirrhosus "
Super Red Ancistris"
Xiphophorus montezumae Montezuma Swordtails
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(I'm in the middle of resetting and redesigning my fishroom - so things are kinda quiet)