Re: Hair grasss
WPG: Watts Per Gallon
3 WPG is considered a high light tank. With that much light, the plants will use what they can of the nutrients in the water. The problem occurs when a nutrient is lacking. Algae need very little of these nutrients to grow as they are a simplier organism. They can use a nutrient when your test kit cant even read it. Co2 helps the plants use these nutrients for storage when something is lacking. No Co2, no plant absorbtion at that light level. Algae wins.
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