Sorry....my oscar is 5 to 6inches big what size pellet should I buy? also I have 2 overflow boxes so ill use sinking pellets I suppose so it doesn't get sucked into my sump
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3mm sinking would work fine. Try Thera +A if you can find it, but any of the NLS formulas will work just as well they are all very similar. You don't need very large pellets I use the smallest size practial it avoids waste.