MariSource 7009 St Ct E , Fife , Washington 98424 USA About Solutions products Companies MariSource Products MariSource - 2-Layer Substrate MariSource - 2-Layer Substrate From Incubator Components 0 Share MariSource substrate assists in replicating hiding locations and shadows for the Alevin while in the egg tray. This is this kit is folded into two layers. This kit contains four units. Most popular related searches egg tray Additional Information Species Trout, Salmon Customer reviews No reviews were found for MariSource - 2-Layer Substrate. Be the first to review! Add your review Publish your review Great! review successfully added!