Thanks, I have a large diy cal reactor, and dose Mag, it's the others I'm wondering about. I've been adding a few products containing the other trace elments and vitamins also and so far so good, but I'm sure they would be more balanced if I did it with water changes, but 130g water changes is a bit much for me. I do change 50g about once a month.Well, CA and ALK would be the two most important elements to replace, followed by MG, Strontium, and the other major elements. Even with a low nutrient system I still conduct water changes once a month with Reef Crystals to replace any minor elements/vitamins that may be lacking. I used to go months without water changes but since I have started conducting monthly changes of 20% I have noticed increased coral health and vibrancy. You could always look into a supplement to replace the elements in your system that have been used up but this may cause more problems than it may be worth. A 20% monthly water change may be your best bet.
