urgent

I accidentally spilled some methylene blue in my 40g cichlid tank. Only a very small amount. I unplugged all the filters and removed them from the water, and I'm changing out the water right now. It is only a very light blue. What else do I need to do? I'm very upset...a complete freak of an...

I bought a stingray that will be shipped here tommorow and I need to make sure these tiles are fish safe, the tiles are ceramic