Seachem Reef Reactor Media Medium reef kalkwasser They are excellent for fry

They are excellent for fry tanks because they won't suck up your babies

brewers yeast

making them extremely durable

Safety shut-off activates if removed from water

Chip size makes spot cleaning easy

Seachem Reef Reactor Media Medium reef kalkwasser They are excellent for fryReef Reactor is a high purity source of aragonite, which supplies all important elements for optimal ionic balance and robust coral growth and coloration in reef aquaria. It has a grain size of approximately 0. 51 cm (Reef Reactor Medium is . 5 1 cm). It is intended for use in calcium reactors where it is dissolved slowly with the addition of CO2. As it dissolves, it provides calcium, magnesium, strontium, potassium, and carbonates among other