Todd is probably correct with this statement. You have had a ton of posts over the last few days, and I'm glad you are asking lots of questions. Make sure you are taking the process of establishing your new tank slowly. Cyano
is a nutrient issue, like was already stated, and adding things from here on and not beginning to address this issue now will only make matters worse.
I might be wrong with this, but didn't you finish top off with tap water and prime? That might be a big source of the issue there if I'm remembering correctly.