I was feeding shrimp pellets the cheap one. Then switched to hikari carnivorous and Poly's were happy and in eternal bliss 
It's not that bad lolIf hikari sinking gold come in larger pellets like 8mm it would be perfect. My bichirs love sinking gold but have a hard time finding it to eat. If u come across someone selling diced tilapia let me know. Cutting tilapia weekly does take time to do. :-(