I am changing over from 250W MH to ATI PM today, i will be having the unit approx 40cm form the water at frist to acclimatise the new light, how long and by what increments should i lower the unit so i dont burn my acro?
I would lower it a little every week until you reach your desired height.or you can put a few layers of window screen over the tank and remove one layer a week until they are all off.
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