I broke down my tank last week, taking the plants out and storing them over night in the bucket I usually use for water changes. Then rebuilt the tank the next day, and am cycling it. But I was doing some stuff in there today and looking in there and I have a whole bunch of snails against the tank walls. I don't know what kind of snails they are, but did these come from the bucket? I didn't take the bucket outside while the plants were inside. If the are growing I guess it means the water is in good shape?