My tank water finally cleared up after being cloudy for a week or so, and I was greeted with the sight of brown algae on the back. I know my kenyis are supposed to eat algae, but it was pretty caked on there (plus do they eat brown algae?), so I just used half of my magnetic glass cleaner (had to get my arm wet. but oh well). I feed them plenty of spirulinia anyways. BTW, my tank has one of those 30watt flourescent strip lights, and its 29g, so yup, fairly low light.