Reason i ask is because my rainwater aquariums turned very very green! im assuming that it is algae.. I imagine in my terrarium im setting up, if i use the bucket of rain water i still have, that in a few weeks the same thing will happen. But idk if its necessarily bad. Im expecting it to do that. Is that ok? Im setting up a terrarium using 100% spangum moss. Im thinking that if green algae does grow on my moss that it would be good? anyone?