We've fed our pacu pond pellets. Unfortunately, as they have out grown their tank, more and more pellets were ending up in the overflow box. I bought the NLS 3mm sinking pellets, but they are so small, they just look like debris in the tank. I mixed the pond pellets with the small NLS sinking pellets and made jumbo sinking food. I did a thread on the jumbo food..not at my computer so can't attach the link. Works really well with no food entering the overflow. It was a problem that had to be solved before the fish are moved to their big tank.
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