You have done the right thing by connecting to this forum. You will learn a lot especially from experienced saltwater enthusiast. You can find helpful information from my feed: Started a 125 Gallon Salt Water Reef Tank
I have completed my 6 week cycle today. I have no algae build up and my water is crystal clear. I did not have my light on during the cycle.
My Nitrate are around 20-30ppm. I am working at getting that down. pH: 8.1, Ammonia: 0ppm and Nitrite: 0ppm. I can convert both in less than 24 hrs. If you do the fishless cycle you can monitor both and make sure you can convert for example 4ppm of Ammonia to Nitrite in 24hrs or less.
You may need to do big water changes to bring down Nitrate and Phosphates levels.