Thank you everyone for responding.
I finally ordered Hikari floating sticks, my aro refused it straight for 4 days. Got him some prawns instead, refused those too.
Went back to the LFS and asked him what he fed the aro. He mentioned it was freshwater shrimp (I didn't know shrimps exist in freshwater too). Anyway, got the shrimp, cut it into small pieces & voila! The aro started eating it. Weird!!
He now eats about 1 full 3 inch shrimp every day. I soon plan to wean him off the shrimp and get him on Hikari, but I'm gonna give it time. I don't want him to rebel and go hungry.
I'm not sure if I mentioned what aro I bought. It's a Asian highback gold.