I have seen quite a few Aquariums of similar size (especially in India) and none have such an interesting design layout or ambition.
Check out the above design layout courtesy their website - http://www.aquaria.se/As one walks thru this tiny Aquarium you see many different habitats.
Starting it a small Rainforest section (with down pours every 15 minutes) all with an nice pond full of tropical fish, tree frogs and also a couple of species of waterbirds.
Next up, a section on the importance of Mangroves, followed by a Marine tank with an artificial coral reef (not pictured). 
The last indoor section is called the Nordic Waters and is dedicated to local fish life.
And just when you think you're done with it all and you step outside on a nice deck facing the bay you see (what according to me is the best part of the Aquaria) the Fish Ladder.Over the past years the Aquarium has incubated, raised and successfully released large nos. of Sea Trout. A fish that is know to fight all odds and climb back upstream along small channels of water to go back to it's birth place to lay eggs.And amazingly some of the fish raised here have returned years later to do exactly that.
I think that is a great achievement - to release these fish into the open bay and seas beyond and to see them come back. Here a view of the bay and the city across it (the fish ladder is to the left of the snap connecting the Nordic waters section to the open bay thru a series of small but steep steps of waterfall)
