Bethany has a fish tank at her house. She uses the following data table to keep track of the…

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<object:standard:sc.912.n.1.1; ma.912.s.3.2=””>Bethany has a fish tank at her house. She uses the following data table to keep track of the nitrate and phosphate levels in the tank.

Month Nitrates Phosphates
January 8.0 mg/L 0.010 mg/L
February 8.1 mg/L 0.010 mg/L
March 7.9 mg/L 0.009 mg/L
April 9.2 mg/L 0.012 mg/L
May 9.7 mg/L 0.020 mg/L
June 9.9 mg/L 0.029 mg/L
July 10.6 mg/L 0.032 mg/L
August 10.8 mg/L 0.038 mg/L
September 11.0 mg/L 0.036 mg/L

Bethany notices that the fish tank is gradually filling with algae. Based on the data she has collected, when did the problem most likely start? Explain.