So my family just started raising these chicks, we are very new to this. One of our chicks died a few days ago from what we think was gapeworm, it was shaking its head and gasping for breathe before it died, it also couldn't manage to keep its head up and was nodding off. We are concerned that the others may in trouble too, we aren't fully positive it's gapeworm but we wanna protect against it anyway just in case. I know flubendazole is usually used for gapeworm but I dont know the dosage and it seems to be difficult to find here. Any advice with flubendazole or otherwise is welcome. 
The chicks are about 3-4 weeks old if that relevant.

The chicks are about 3-4 weeks old if that relevant.