Hikari. they make a nice sinking pellet for lionheads (it will be good for orandas as well). it comes in a black pouch (all of hikari's foods come in the puches). i got the smaller pouch and it was about $7, so its not the cheapest, but hikari makes really good foods. tetra makes a sinking goldfish pellet as well, tetra exotica, you can use that as well for more variety. usually rounbodied goldfish are out-eaten by the faster and more agile slender bodied goldfish like comets, so keep an eye on that and make sure the oranda gets enough food. my 55 with 2 lionhead goldfish is bare bottom because i only use sinking foods, this way they cant swallow gravel while trying to eat. food could also fall between the rocks of larger gravel that is too big for them to eat, so i just didnt put in any gravel. what exact type of filter do you use?