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And the book is right about 80 is ideal but as long as you have good buffer you will be ok just dont let it hit 0 then you will be in trouble with unstable ph
Congradulations! For the hair algae only run your lights 6 hours a day until it's under control and then slowly build back up to 8 hours as long as algae doesn't return. Also spot treat the hair algae with Excel or Hyrogen Peroxide.