This is very sad!
I agree something else is going/went on.
54 fish in 1 1/2 hours screams way more then low O2
How could the system bottom out so fast?
The pros don't wonder what they need,they get what they need X2!
People are allowed to stick their hands in the water at this exibit,and who knows what else?
I have a hard time buying the low o2