Hey folks new to this forum been keeping a 55 stocked with plants and plant loving fish I recently got a new light set up and have a d.i.y CO2 system, but now I have mad algae growth especially on my plants. I have tested for phosphate and I am sitting at a mad 5.0 ppm so I have been looking online for fixes and products to help me combat this and I have hit a wall now that I know that water changes will be seemingly useless due to the fact that my tap water is 2.0 ppm so I was hoping to ask out loud if any of you folks have any ideas how I can get my tank under control..