I have a 12 gal tank w 2 females and 1 male molly. Ammonia is 0 and I just changed 25% of the water. After I did that, the male started hanging vertically (head up) and today has had 2 very long strings coming out; not normal poop. I've read all I can and it sounds like he may be constipated (but does that account for the vertical hanging?). I've been feeding flake food and now see that I have to feed them greens. How do I prepare them? How small do I cut them up? Thanks!