Pond Boss Forums INTRO Questions & Observations WATER DYE

In reference to the BLACK ONYX; I don't have, or know of any specific research to validate an answer. Anecdotal evidence leads me to believe that any reduction of sunlight penetration (especially certain wavelengths) could, to some degree or another, negatively affect organisms that rely upon photosynthetic processes. However, any such organisms that occupy shallow areas or the upper water-column are less likely to be influenced by pond colorants since the impact on sunlight penetration is less pronounced in those areas.