hi all im new to the planted tanks . i was wondering if i need co2 in my 55 gal. discus tank i have cycled the tank for 3 months fishless i have a pic of the tank if needed.

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Hi Barb, most likely you don't need CO2. Can you give us some details about your light fixture? This determines whether you should add CO2 and fertilizers, or not.

its the regular light fixture that came with the tank and im using a tropic sun 5500k daylight from zoo medits 32 watts t8 my sbustarte is eco complete for plants and 2-3 mm gravel on top if that helps also i use air stone in the day and turn off at nite

The standard light fixtures sold with tanks are not sufficient to grow plants... they barely illuminate the fish. Adding a second fixture like that would be a step into the right direction. Still very low light with little need for added CO2 and ferts, but it will keep plants alive and even growing.