It's a very complicated question that gets discussed a lot on here. The basic answer is you get rid of your algae by balancing light, nutrients, waste removal and water changes. You'll need to provide a lot more information about your setup for anyone to provide useful info. Size of tank, light intensity and duration, type of substrate, method of fertilizing, CO2 or not, water parameters and frequency and volume of water changes.
Adding baking soda could kill your fish with a sudden ph change (If there are fish) It won't do anything for the algae.
Adding baking soda could kill your fish with a sudden ph change (If there are fish) It won't do anything for the algae.