I think everyone on here will have had algae issues at one point or another. You can get through it, have search for Sophos9, he seems to grow more algae than plants
What is your current setup?
Lighting level (watts, tube type)
How long are lights on for?
Substrate?
What plants and how many? What percentage of the substrate is covered?
Are you adding any fertiliser and if so what, how often, and how much?
Is the tank getting any direct sunlight?
CO2 is not the answer to getting rid of algae, if done badly it can increase algae, so don't be worried that you don't have CO2 at the moment.