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The green water is because you have far too much light for a fish only tank. The fish waste is largely ammonia, which is a trigger for algae growth. The high light encourages algae growth just as it encourages plant growth.

When you get the tank planted with lots of fast growing plants you probably have about the right amount of light. That 15 gallon tank is too small for the general "rules" about 2 watts per gallon to apply - more is needed for small tanks. And, the extra depth of the tank reduces the light intensity at the substrate level enough that you also need extra light for that reason.

Whatever plants you decide on, make sure you start out with at least half of the substrate covered with a plant every square inch. That would be a "heavily planted" tank, which is the general rule to avoid algae when first planting the tank.
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