I'm trying to decide between 3mm and 6.5mm pellets for my year old oscar that I rescued this weekend. He's about 6.5 inches and very stocky- he'd be living in a 10G tank. 
I think the 3mm would be kind of small, but I've heard that too big just creates more waste.
I think the 3mm would be kind of small, but I've heard that too big just creates more waste.