One thing about hair algae, it is almost always due to excess nutrient or silicates and excess light. The more it grows the more, other things begin to die and this causes them to leak more nutrients into the water. Are you using any ferts, plant tabs, or well water? Now about the lights. You did not mention the type of lights or the wpg, but right off hand you have them on for 13hrs!!!! That is way too long. Shoot for 8-10hrs max.

Please fill us in on the rest. Test your nitrates, nitrites, and ammonia. If hair algae is growing and fish are dying then something is off. Ohh, and when the fish die, do you take them out right away or do you let them decompose in your tank....which leaks more nutrients.

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--->Pictures of my 75g Amazon tank<----