Sea Hare Split Hole to Hole

MechEng99

aka Reef'd Up
In order to help control the amount of green hair algae in my tank (due to the tank being by an uncovered window due to renovations...can't be helped), I obtained a sea hare a couple of weeks ago. (Other types of algae were supplemented.)

A couple of days ago, I noticed the sea hare had all but quit moving, and a dark mucus-like matter was oozing from one of its holes (congealed ink?) Today, it quit moving but would respond to touch for half of the day. I came home from school to find it I believe dead.

Here's the weird part. About a week ago, I noticed a small mass of eggs. Seeing as how there's only one sea hare, I figured it had to have been a snail or something (reef only tank.) I also didn't think it could be a sea hare due to the reported HUGE number of eggs they lay. I ignored the eggs. Today, before the sea hare was completely dead, I realized that there was a split between the two holes on its back. It didn't look forced, but more of a natural fully healed split. There was a white tube in between both holes.

If I remember correctly, the "male" genitalia of the sea hare is near the head, and the "female" part is the goniopore on the back. So what was this split/white tube going from hole to hole?

Here's the weirdest part. As I was getting ready to remove the sea hare from the tank, I noticed a very very very tiny blob floating through the aquarium. I caught it, and it attached to my finger just barely, and started moving across my finger. It was shaped like a fetus with a defined head and body curled together, no bigger than maybe 1/4 of a pencil eraser.

Could my sea hare have had fertilized eggs, then laid a few in my tank shortly after arriving...then died as its life cycle was over...and one made it??? This is really weird. Any ideas??
 
Yikes. Hmm...interesting.

Here are some pictures of the sea hare split and the baby creature I found. Any ideas?

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Please realize that the second picture creature is about 1/4 of the size of a pencil eraser. That's the absolute best picture I could get.
 
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