- The Oase Hel-X 13 BioMedia for the Oase BioMaster 250, 350, 600, or 850, and Oase BioMaster Thermo 250, 350, 600, or 850 includes a replacement BioMedia allotment
- Includes a large surface area across this suspending media form which is ideal for biological filtration
- Allotments contain 0.3 gallons of BioMedia
- Replace your ceramic filter media only when completing a complete tank restart so as to not disturb the beneficial biological load
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