D. zebra is not sexually dichromic/dimorphic, so I wouldn't keep two specimens in the same setup.
That first little fuzzy has a nice yellow stripe down its back. Looks like a little female, altho super small specimens sometimes fool you.
Dime-sized lions are really great, but are a bit more touchy in terms of being delicate and needing smaller food items. It's really cool to grow them up from that size tho.
Leaf fish will normally sway back and forth like that, esp. at first. Sometimes they sway super hard and fast when they see the food coming...almost to the point of "*** is wrong with that fish?".