The arcadia marine blue actinic promotes welfare of invertebratesr for a marine aquarium to realistically represent reef life it is essential to provide the best conditions for corals and invertebrates to thrive most important in this is the survival of zooxanthellae a specific form of algae which symbiotically assists the invertebrates to feed and remove waste matter in nature the sun provides over 100 000 luxlux lumen per sq metre at depths of typically 5 to 10 metres where many of