55 gallon lighting

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Depending on the quality of the fixture, you will have between medium and high light. You might need CO2 to keep the algae at bay, but you might be able to get away without it. It hinges on a number of factors.
 
Depending on the quality of the fixture, you will have between medium and high light. You might need CO2 to keep the algae at bay, but you might be able to get away without it. It hinges on a number of factors.

The fixture is a normal output T5.
 
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