yeah... if you want to see plants growing inches in a week, use a presurized co2 system. ofcourse, then you need to start fertilizng the water column with fertilizers; potassium nitrate, potassium sulfate, and then monopotassium phosphate. i can give you levels on this if you decide to do it...or alternatively you can use a specialty aquarium soil designed to grow plants in the presence of additional co2 like nothing you have ever seen in your aquarium, and then there is a decreased need to fertilize the water column.
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andrew yaros
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