very nice!
I don't know much Spanish (despite the fact that I use the Spanish language to communicate with my parents) but those names look a bit off.... and if this is in Brazil, why isn't it Portuguese? xD
I'm not sure if I should say these, but here are some options
El Acuario Negro (Black Aquarium, as in.... Rio Negro... xD)
Riocuario (play on "River" and Aquarium" roughly translates to Rivaquarium LOL)