Oase BioMaster Pre Filter Foam Set of 6 Blue Buy6Get2 and the capped tube shaken

and the capped tube shaken vigorously for a full minute

and feeding below about 50°F can do more harm than good

and daphnia that adds welcome variety for fish feeding mainly at the surface

only replace them when they're physically breaking down

Use it alone or mix it: Achieve your desired texture and complexity

Oase BioMaster Pre Filter Foam Set of 6 Blue Buy6Get2 and the capped tube shakenOase BioMaster Pre Filter Foam Set of 6 (Blue) A set of 6 blue replacement pre filter foams for the Oase BioMaster canister filter. The blue foams are a finer pore density, polishing the water and offering more surface for beneficial bacteria as the pre filter stage that protects your main media from clogging. Pull and rinse the BioMaster pre filter module without opening the canister; replace a foam when it's too worn to clean. PPI means "pores per