Also fwiw , gha is not a phase that you have to go through its certainly not a guarantee regardless of the type of rock you use so at the point of gha you should be asking yourself what's missing here? It all comes down to access to nutrients .......who has access to them first and what they do with them and what I or you can do to use this to my advantage
Manipulating how nutrients are used and exported can be one of the most useful tools in keeping a healthy reef be it to keep away pest algaes or to overall improve animal health.