If you are talking about runescape then no, water dragons don't turn green ever. :) :P
yours sincerely
Winner1
They get stressed and that makes the color change happen. Sometimes you will also see dark squigley lines on their belly.
Easy, just breed water and dark dragons
most animal i know are more stressed in the dark
Easy, just breed water and dark dragons
Yes, there could be good dark dragons. "Dark" does not at any point simply "evil" or "not good". Since they have no correlation, there can be good dark dragons. (Case in point).
No.
Yes. Some types of dragons, such as night dragons, can.
No, some blow out ice and/or water. If you count Dark or Black fire, then that too.
Light Green for COLD Water and Dark Green for HOT water
The green water has many bacteria to cause vomiting and headaches
light
* Dark dragons are usually powerful dragons either with dark complexion or is associated with magic which is "dark" as opposed to the "light" magic which religions embody. Due to either association, dark dragons are usually seen as outcasts, which drives no small amount of the dark dragon population to unorthodox ways which gives them a bad name. Despite such social stigma, there are exceptions to such a rule. See related questions for further discussion on this topic. * A login on Wikianswers