JBL Tropol quickly converts aquarium water to tropical water with the typical properties of black water. The combined effect of peat + oak + iodine makes fish feel as if they were in their natural habitat. JBL Tropol promotes the health of the fish through the humic substances of peat and the tannin of oak bark. Active iodine promotes spawn willing. Facilitates new stocking with all blackwater fish (e.g. neon, angelfish, discus etc.). JBL Tropol reduces stress and prevents algae.Dosage: 10 ml for 40 l water for new aquariums and every 14 days or for changes of water. 100 ml are sufficient for 400 l water.