I know butti doesn't eat feeders but i figured a change cause i just feed him pellets all the time... i think im gonna see whats at the local fish store and see whats available. And for Oii.... dude that thing will get aggressive i say once it hits the 4" mark espeacilly in a tank that size. Right when mine started to get larger and the anal fins started to get larger it aggression went through the roof. Its funny cause everybody who saw the tank b4 he got crazy maybe when he was 2-3 inches thought he was the cutest fish... now he is the dominant monster lol... so good luck OII.