So I returned from holiday again to find my tank like pea soup. Reading a thread elsewhere I understand once algae outbreak happens the only way to remove it is by removing the light source? I'm planning a 50% water change tonight with a 4 day black out. Would it be best to remove as much water as possible? But other than covering my tank and doing the water change what should I do? I am assuming here that my filter is now cycled and has reduced the ammonia level in the water.