never did clear out the green water. i didnt get nearly enough fairy shrimp to hatch out. i imagine if i did a big water change with RO i could get the eggs to hatch, but i dont want to risk shocking my shrimp, so i just moved a UV sterilizer on it. i dont think the green water will hurt the shrimp, but i have noticed that when i keep shrimp in green water, or without any lights on them, they have a tendency be a bit on the dull side. i think the filter was a bit too much for the fairy shrimp too. for this to work, i would probably have to grow them out in another tank and then move the adults over to the shrimp tank, since the adults are strong enough to avoid being blown around and sucked up by the filter.