had a pair of barramundi's for two weeks now, last night changed about 50 % of there water and turned the light off. and this morning when i went pass there tank both dead 
they were only in a 4.5 g tank but then they were only an inch long each them selves.
before everyone flames me for the tank size, they were in a 16 g tank but a late night noise showed me a cracked tank and only about 2 inches of water, they were in this tank until i could afford to replace that tank with a new one, was going for a 260 g tank for them, even that would of only suited them for a while. but long enough to build ply wood tank in shed for them.
brakken

they were only in a 4.5 g tank but then they were only an inch long each them selves.
before everyone flames me for the tank size, they were in a 16 g tank but a late night noise showed me a cracked tank and only about 2 inches of water, they were in this tank until i could afford to replace that tank with a new one, was going for a 260 g tank for them, even that would of only suited them for a while. but long enough to build ply wood tank in shed for them.
brakken