Hello there fellow fish keepers !

I am a "Gar newbie", have two Atractosteus in my fish tank, they are about 16 cm long.

They love eating live Gambusias, but for some reason, at this time of year ,- in my Country- is hard to get those ones...

For a few days, they did have some "pond sticks" with no problem at all, but my brother fed them the following day with their usual Gambusias without knowing it...

They have refused to eat processed foods since ...

I have tried "tricking" them moving the sticks, fresh stripes of fish and shrimp and so on, but...no good !
What can I do ?
Thanks !