Free delivery on orders over £50.00 in the UK Online Catalogue : Products For Tropical Fish : Glass Aquariums : Base Mats Clearseal Base Mat Black mat for protecting the bottom of aquarium. Use instead of polysterene. 18" x 12" Base Mat - £3.98 24" x 12" Base Mat - £4.81 30" x 12" Base Mat - £5.02 36" x 12" Base Mat - £6.20 24" x 15" Base Mat - £5.25 36" x 15" Base Mat - £6.77 Can't find what you're looking for ? email us - sales@fishybits.co.uk