approximately 9X8 centimeters

Chaetomorpha Algae for Refugium and Algae Reactors in marine aquariums. Excellent for refugium or algae reactors. Helps lower the level of pollutants (especially NO3 Nitrates and Phosphates) It also contributes to the elimination of CO2 and therefore to an increase in Ph e of oxygen levels in marine aquariums. Excellent system against unwanted algae through food competition.