Oscaroo you are up late, did you work out your mum's WIFI password?
yes bichirs may feed from the surface I have had my ornate do this before but in my experience it is only when they are very hungry that they go to the surface. Feeding a bichir from the surface has absolutely no benefits as the other fish will always get to the food first. If anything you want to teach the bichir to take sinking food after the lights are out, that way you know when you put them in your main tank they will get food every single night and the other active diurnal fish will not steal it from them.
My small ornate used to surface feed occasionally and I would give him cichlid gold but anything I put in the tank now my giant gourami will eat, so I put food for my bichirs and clown knife in after lights out and that way they all get fed. If you are wanting to add hikari gold to your bichirs diet for nutrients then by all means just crush them against hte glass til the small bubble of air comes out, that way you can just sink it to the bottom.