yes. it's only 1 ml. but it doesnt change to blue, unless I use more. 0.2 or so, of a second syringe. if I am doing it wrong, I'd greatly appreciate help. I'll look at a few more youtube videos. I am just not wanting to create more issues.I just watched a YouTube video on using it and it seems very similar to the red sea. Is your issue that it never changes to a blue color or is it just figuring out the value because of it taking more than 1 syringe? I'm a little confused on how much it took because in your original post you said 1 syringe and 1.5ml from a second. Isn't the syringe only 1ml?