it should still not just be cast aside using algae systems. especially for lagoon set ups that include catalaphyllia, gonioporas and similar (corals that do pretty poorly these days, and which i had no problem keeping, growing and multiplying in an old setup years ago that had huge amounts of caulerpa, HA and other algae growth). it seems that certain corals need the enviourment. also algae would release "nutrients" back into the water that may be needed / utelised by some corals. one should remember that coral reefs are actually algae reefs but due to the massive amounts of herbvores are grazed upon all the time so that many algae are visible to the eye. in most SPS tanks nowadays one doesn't see any algae and i wonder if this is a good thing?