BRS has a great video about refugiums and lighting. If you are experiencing slow to no growth with your chaeto it’s likely that your light source isn’t powerful enough; Meaning that your DT lighting is much more intense and nutrient uptake is occurring in your DT rather than your sump.Has anyone used the led grow light from costco on there refgium. Been debating it. Currently using a fiet electric grow light. My cheato is alive and doing ok but no significant growth in close to a year. Attached pictures are the light spectrum. View attachment 18500 View attachment 18498 View attachment 18499
Right now I'm using a Kessel H80. For the size of refugium that I have, 24 L x 18 W x 16 H, it's a little to small. But it's still doing a fantastic job. I'm probable go with the next size up.