Silver Dollars Spawning.

[Adoptedfish13]

I have only 2 recently obtained Silver Dollars but they were just caught spawning!
 
Is it possible for any fry to hatch with 7 corydoras in the tank?
 
Also, I would like to know if the spawning behavior even means that the fish are different genders. They look nearly identical as far as their shape and only see a slight difference in the display colors. One fish displays lighter black on the lower spot behind the gill but otherwise it looks the same.
 
I swear that they were being shy and hiding after my husband was placing false plants in the tank yesterday, then I was trying to get some phone pics of all the fish about an hour ago. Suddenly they just came out and spawned in front of the skull in broad tanklight!
 
I will try to get better photos of them and post them tomorrow because I didn't get clear shots of both fish with my phone this evening. 

 

[Adoptedfish13]

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Trying to embed a clip of the SDs.
 
I am horrible at this...
 
Well at least there is a link. lol
 
They were just caught again when I didn't have the phone on me. By the time I got the phone and waited...
 
They weren't looking as enthusiastic as before. In the clip, it appears as if only one of them is really into it.  

 

[Adoptedfish13]

I have a feeling that my fish are 2 males, but what do I know?
 
They are still going at it several times a day. 
 
 
 
Can anyone please tell me how to embed my little clip? It was my first youtube upload.