Mephistopheles
Aquarium Advice Activist
Whenever I do add water to my 30 gallon (including top offs and water changes) I seem to get a significant microalgal bloom. I tested the water source for nitrates and found none. I also tested it for phosphates. According to the color scale, I'm somewhere in between the .5-1 ppm range. I know that Ideally that number should be zero, but is this enough to trigger the algal blooms?