Not sure how they started but I got em and only on the sand bed.
1) will new lights cause them?
2) will keeping the lights out for a couple days get rid of them?
I know it's usually a new tank syndrome and what they are but not sure what would cause them this time.
Never mind I read a link about them. I just recently started using Dawn dish soap ( I now know this was a dumb move) to clean my WC bucket most likely wasn't rinsing it out good enough. Will use no more.
It's not just Dawn, most soaps have them. To quote an article:
"The silica shells of diatoms are made into things such as toothpaste, paint, polish, soap, and even ice cream."
So, yea, don't put toothpaste or paint in your tank :D