No, you don’t need to condition distilled water. Just make sure you mix the salt to the correct salinity using a refractometer to guide you. You should indeed be able to grow corals, just make sure your parameters are right (ex: alkalinity, calcium, magnesium). Also make sure others have had success growing corals with the light on the biocube. I would highly recommend renting a par meter to see where you can place the corals and if the light is capable. Happy reefing32 gallon bio cube, do I need to water condition distilled water too? And can I grow corals in that