I've only just started adding this but Brightwell makes "Chaeto Gro" liquid supplement which is supposed to have the nutrients needed to keep chaeto happy. My guess is that plus good refugium light should help.I like this method. I’ve cut down considerably on feeding the corals because of bubble algae and slight cyano. I have tried a refugium 3 times in my Trigger sump and I just can’t get it to grow. What is the secrets?