Photo period question

sagxman

Member
A few months ago I was having some algea problems and I cut the photo period on my 20 Long to about 8 hours of light. Since then things have stabalized and I want to increase to about 12 hours of light. How fast or how slow should I make this change? It's obvious that I shouldn't make the change overnite but should I increase and hour per week? an hour per day?
 
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