Seachem - Tidal Replacement Foam Filter Seachem Sale! from 595 /per Model Tidal 55 Tidal 75 Tidal 110 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. Foam Filter Replacement for the Seachem Tidal Power Filters (2 pack) Available for the Seachem Tidal 55, 75 and 110 Filters