You might find this interesting if you pull the leathers, and do some water changes you might find the hair algae disappears. Leathers tend to slim a lot, which in turn leaves a lot of junk in the water, which we all know hair algae loves.

Z28pwr just a question, but what kind of products are you using to add your calcium, and also what kind of other things do you use? If you can, can you list all the products you use.

Nick