Are my fish in love and going to mate!!?

Okay, so I have a Glo Tetra (Electrica/Spazz), and yesterday, I added 2 more fish... Cardinal Tetra (Zoe) and a guppy (Ivery.) Also, I have no clue what their genders are.

So, Since I have no idea what their genders are, they might mate, right? Well, I have some questions..

Are they going to eat the eggs? Cause the guy at petsmart said that they would

If I don't want them to eat the eggs, then how do i get them out? do i take them out with a net? And then where do i put them?

how do i know that one of my fish is pregnet?

what are the symtoms of them being in love, like what do they do?

how long does the mom fish have to wait to give birth to the eggs?

where will the eggs be? on the top of the water?

Thanks Much!!

Oh, and my brother has a micky fish (its pretty cool, it has a mickey mouse head on its tail) and her name is minni and he has a sunburst and his name is buddy. we dont know the genders, but they're acting pretty friendly, like fallowing eachother around and stuff, does that mean they're in love? will they mate?
by the way, they're in a 2 gallon tank with an air pump and 2 silk plants
 
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