You have to get it from on of your friends posting it on their feed.
You can get a purple, blue, hot pink, and golden squid. You can get the golden and hot pink aquid by mating the blue and purple squid.
Your happy aquarium neighbors post them for adoption
You do absolutely nothing with it. It eats, swims, craps and spasms when you touch it just like all the other fish in your tank.
Another golden squid.
Nope
if your friend found any lost squid, you will have a chance adopt the squid for free. sources : http://www.yayeasy.com/happy_aquarium/new-baby-squid/
Hot pink and gold
there are turtle, squid and penguin available for adopt, if your friend found any lost orphan by click on the adopt you will get a chance adopt orphans sources: http://www.yayeasy.com/happy_aquarium/happy-aquarium-baby-sea-turtle-adopt/
You have to click "adopt a baby squid" when one of your friends posts it up for adoption.
You can only adopt male baby sea turtles and female squids, but if you want the female sea turtle you can buy it for 23 pearls or the male squid for 623 coins. Hope this helps! (Oh and if you were looking for more interesting colors, you can mate the male and female squids and possibly get a hot pink squid or golden, or if you mate the turtles you can get a gold one.)
Blue or red :)
Now the Happy Aquarium store is offering blue male squids for 623 coins. It is under the Special star tab. You can mate them for 312 coins. You cannot adopt them, only buy.