Since you aren’t keeping any coral yet (good to wait!) you can minimize light duration and intensity. That’ll help some, but really it doesn’t look bad.
Do you have a skimmer the sump? If so I'd consider replacing that with a chaeto chamber. In my experience growing a little bundle of cheato is far more effective at reducing nutrients than a skimmer. To be fair though I don't have a super expensive skimmer.
Do you have a skimmer the sump? If so I'd consider replacing that with a chaeto chamber. In my experience growing a little bundle of cheato is far more effective at reducing nutrients than a skimmer. To be fair though I don't have a super expensive skimmer.