No problem
Try to brush off that algae weekly, syphon out that gunk and complete a 10% water change each week. Algae prevents coralline algae from expanding and will kill corals if allowed to go unchecked.
It’s important to maintain low nitrate and phosphate to the levels shown above.
Manual removal, water changes, carbon dosing and running GFO are ways to manage nutrients through the initial cycle period which may take several months.
Mexican turbos and ninja astreas snails will help keep it in check.
If you maintain those levels, at one point, algae will diminish till virtually zero.
Yup, nothing wrong, this stage known as “the ugly stage” and will continue until the tank fully matures, say 8-12 months.
If you have any Stoney corals or want the coralline algae to build, maintain the following three parameters, regular water changes should keep these in check.
Alk is the most important at 8-9 dkh, CA at 450 and MG at 1360ppm will keep Stoney’s and coralline happy.
Stability in parameters is what you want to accomplish, when all 8 are stable, virtually all corals will thrive.
Hope that helps!