I have two salt water tanks. The only time I see that Ugly Stage algae is when I use water from the kitchen sink filter. The kitchen sink filtered water is 25ppm. Most likely phosphates and silicates. Not certain it is Ugly Stage algae, but my snails do away with it in a few days. When using zero ppm water I do not have that problem. I am thinking poor water quality creates the Ugly Stage. I have had my first tank for over a year and yet no Ugly Stage. What say you?
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