Tropical Querex is an oak bark extract for establishing water conditions that facilitate breeding and reproduction of ornamental fish. Tropical Querex adds to water natural tannins - organic chemical compounds classified as tanning agents, to create living conditions similar to those in which blackwater fish live. The prophylactic properties of oak bark have been used in natural medicine for centuries. When placed in the tank, the oak bark extract creates favourable living conditions, helping keep fish population in good condition. In tanks where oak bark extract is used skin problems occur only occasionally. One rarely observes fish rubbing against elements of equipment or decorations. Adults are more willing to spawn. The hatch and survival rates of the fry increase as well.Tropical Querex encourages fish to spawn, effectively protects the eggs, accelerates the regeneration of epidermis, mucus coating and fins of the fish.Application & Dosage of Tropical Querex:Add 10 ml per 100 l of