It does cost a bit to go in, try to angle for student discounts.
They have all types of fish; exotic marine (clownfish, lionfish, sea horses) also octopus, rayfish, larger sea fish, otters and a chameleon, frogs, lizards. It might be worth calling them first to check the creature you want is there.
Blue Reef Aquarium,
Clarence Esplanade, Southsea, PORTSMOUTH,
Tel: 02392 875222