Young Dicrossus typically will not take any prepared foods except maybe small sinking granulate food. Live food in most cases is a necessity for their long term survival. Moina or live BBS will do, as will Tubifex/Grindal worms. In the case of Grindals you can culture them yourself. Frozen Daphnia may be eaten but if they do not like the "taste" they will not eat it. You can keep live Moina/Daphnia alive for days if you have a spare plastic tank that has been well-rinsed. Add in some distilled or aquarium water from an old setup to the tank and place your leftovers in there. Sieve out what you need with a brine shrimp net that has a very fine mesh, rinse the stuff with your tank water and then add directly to the tank where your Dicrossus are. They will remain alive for days if the conditions are right.
You can also find people who have seed shrimps aka Ostracods (usually shrimp keepers will have these by accident), and culture them in tanks with a lot of detritus. They make good food for small cichlids and are super easy to culture.

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