I asked the manufacturer of the "dutch synthetic reefing" method his opinion on ATS systems. He explained algae releases compounds that may affect sps corals. Apart from that, he has never seen an sps dominated aquarium do really well with an ATS-only system. Apart from that, Julian Sprung recently released this video; I wonder to what extend algae does release compounds, if so, which compounds? And to what extends are these compounds harmfull?