Hello everyone. I need some help clearing up my water. It has horribly green water. I believe it was caused by leaving the lights on too long and possibly being out of spectrum. I just got the tank not quite a month ago, and it just finished cycling. We bought the tank and all the equipment used. The lady we bought it from said the lights were brand new and had just been changed... however I think they had pretty thick salt creep on them for being brand new. In the tank are 10 tiny hermit crabs, 10 turbo snails, and 4 green chromis all of which seem to be doing fine other than not being able to see them. The LFS suggested turning the lights on for only 8 hours a day, and using a product called biomagnet and filter floss. The bio magnet is one of those products that is supposed to clump the algae together so it can get picked up by filters better. It doesn't seem to be doing a whole lot to help. Its been about four days and it hasn't gotten much clearer. I have been doing some research (googling) and what I have found is that most people suggest doing water changes and leaving the lights off until the algae goes away. The LFS didn't recommend doing water changes since the tank is still so new. They also strongly warned against UV filters because it will also kill the good bacteria and things I want in my tank. I am afraid that if I leave the lights off until the green algae blooms go away I will damage or kill the live rock as well. Would it do any harm to any of my animals (hermits, turbo snails, green chromis) to leave the lights off for a while? I don't mind waiting for it to clear up, but the snails like to climb out onto the roof of the tank and then sometimes they drop and land on their shells. I am worried that they will fall and I won't be able to see them to upright them. Thank you very much for any advice you can give me! -Stephen tl;dr would it hurt my live rock/sand and animals if I leave the lights off to kill the water borne green algae blooms? Should I do water changes even though the LFS recommended I wait? My tank is about 3 weeks old.