I recently added another light bulb to my tank(72), making it 160 watts with two 6500K bulbs and two 5000K bulbs. I noticed the other day that there is this black hair algae on my anacharis and this turquoise color on the stems of my red foxtail. Why is this? All the water parameters are fine, nothing has changed, just the addition of another bulb. I keep the lights on from 10 a.m. until 9 p.m.