The aquarium was developed in 1850 by robert warrington.
A specific aquarium or do you mean like a fish tank in people's homes?
In home. For Fishkeeping, people that like to keep fish in home aquarium's
OH!  My daughter has 2 freshwater tanks.  My dad had saltwater when I was growing up.  It can get expensive.
Had no idea they had both fresh and saltwater aquariums.
Yes, but saltwater fish are MUCH more expensive to buy and they seem to be a bit less hardy.
Ever have any tropical fish?
Yes, even freshwater versions have tropical options.  Like cichlids.
Cichlid? Are they not a large and diverse family of fish?
They are - and they are not very nice to each other.  My daughter kept having issues with them fighting.