BioTek Marine - 4" Replacement Media Reactor Foam BioTek Marine Sale! from 800 /per Qty. Add to Cart This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. For the BioTek Marine 4" Media Reactors. Also compatible with Bashsea, Sicce and Me Coral and BioTek Marine media reactors.