UNS Controbase Substrate Supplement

UNS Controbase is a highly porous volcanic base layer substrate infused with essential slow-release macro and micro nutrients (nitrogen, phosphorus, potassium, and trace minerals). Placed beneath active aquasoil or gravel, it prevents substrate compaction, encourages beneficial aerobic bacteria colonization, and supplies long-term nutrition to heavy root-feeders like Cryptocoryne and Echinodorus. Volume: 2 Liters (contains 4 individual 0.5L mesh bags).