Ugly phase coming in strong!

New build

40 gal breeder: free on Craigslist

Handmade stand: $120

Misc equip: $200ish

I have 2 clowns but my Banghi Cardinals decided to host my lta...

I had a huge bloom with my palythoas but my tank growth has been at a stand still for a couple of months since and tips?

Still working through the diatom phase but any suggestions on clearing up my water? Using floss and activated carbon.