Nice tank, as everyone said above this is the typical “ugly” stage we are all have to go through. It’s a good thing, means you’re growing organisms in your tank. It is possible it will get worse before it gets better. My best recommendation is to be patient, as some said above reduce light exposure, continue your routine maintenance. Do not go off cleaning everything since you will cause another algae bloom to restart since you scrubbed the water clean. I believe your tank is an AIO, if you do, try not to run the protein skimmer. You don’t have much live stock, and you’re doing water changes.
I do recommend staying away from chemicals. Learn what is causing any nutrient spikes, there are some good YouTube videos on BRS channel. This will help you be a better reefer. Be mindful of the food you give your fish. Frozen foods are preferred during this time.
Towards the end of this process you may see cyno blooms occur (brown/reddish on sand bed), again maintain your regular routine, be patient, and keep an eye on parameters. Don’t let them bottom out. Once you’re out of this stage, you should be a solid ecosystem and mature tank. Best of luck!
