where does "hair algae come from? I am in the process of using AmQuel plus (it says it removes nitrate, nitrite, ammonia, chlorine & chloramines) and Cycle in the tank as sugested by the fish people at my LFS.
The spores for algae can be carried in the air, and there is probably some in your water. Unless you keep a sterile clean room, like the once Intel uses to make microprocessors, algae and all life is going to find a way to use water.
AmQuel plus doesn't remove nitrate and ammonia, it temporarily changes it. It comverts into a form that is not as dangerous for the fish, but is still usable by bacteria and algae. So, it is not a permanent solution.
Answer these questions for me:
What is the nitrate reading in the tank? Of your tap water? Is the tank cycled? (Just to make sure you know what cycled means, does your tests for ammonia and nitrite read zero every time?)
How frequently and how often are you doing water changes?
What are all the inhabitants of your tank? What is your feeding schedule like? Is all the food consumed in 1 minute, 3 minutes at most?
How long are the lights on for? How many watts are the lights? Does the tank get prolonged exposure to direct sunlight?