Lots of frozen food. From fish fillet, mussels to prawn or shrimps. I don't feed pellets anymore as they are expensive and I may need a lot of them too. Not just that but it keep making my water cloud fast and very smelly. Also my fish don't grow fast compare to the frozen foods that I found in fish markets that I feed them. Most of my bichirs that were feed pellets before only maxed out at 18" and stop growing. But now my fish grow fast and hit 20"+ in no time.