BioTek Marine - 6" Replacement Media Reactor Foam BioTek Marine Sale! from 1000 /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 6" Media Reactors. Also compatible with Bashsea, Sicce and Me Coral, MRC & other 6" diameter media reactors.