I do use an RO but it is not DI, my other tanks are not doing the same but they have been running for years. Hope that I can get this under control soon, I hate seeing it look like this.... but thanks for your input...was thinking along the same lines
Have a soon to be reef tank, I hope, that has been cycling now for 4 months and it is starting to turn a tan/light brown color everywhere on the rocks, sand and even the glass...can anyone make suggestions... Thanks