I got a tank around 3 gal
after seeing my teacher (whom had around 5 tanks in the classroom) and put a goldfish in there.
Then i got a ten gal
and put tetras in there then another 10 gal
(i no longer own this one) made it a shrimp and cory tank. I now have 1 10gal 1 3gal 2 25gal and 1 30 gal