I have tried the ATB and NPX pellets. These pellets look different both in color and size. The ATB pellets seem to last a lot longer. Both seem to do a good job.
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Vince
Current Tank Info: 220 Gallon Tank 72L x 30W x 24H, FOWLR, APEX Controller, ATB 1260 (Large) with Airstar 2000, Ozotech Ozone with Avast Reactor, Tripplite 750 Inverter with Optima Batteries, 72' Current USA Extreme Pro T5 light
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