Guppy Gender

[lilgampla]

How can I tell what are male and female and I brought some from a new store I've added 2 pictures

If you can help thanks in advance also I have 2 danios how can i tell if they are a breeding pair

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[fluttermoth]

To sex guppies, you need to look at the anal fin. That's the one on the fish's tummy, just in front of its tail.
 
Females have a normal looking, fan shaped anal fin.
 
Males have their anal fin modified into a rod like structure, called a gonopodium.
 
Danios are harder to sex, but females, when they're ready to breed (because they're full of eggs) will be plumper than the males; you can usually see a bend in the stripes as it goes over their tummy. If you wanted to breed them, you'd need a separate tank,as otherwise the eggs or fry will be eaten, and you need to get more more; danios live and breed in shoals, not pairs, and they won't be happy (and you might see some bullying), if you have only two.