A fish tank in Dunedin Hospital cost $73,000 to install and more than $1000 a week to run in its first year.
However, the cash-strapped Southern District Health Board says the maintenance bill will be ''significantly less'' in the tank's second year of operation.
The tank is funded by donations to the children's ward.
It cost about $56,000 to maintain in its first year, not including the cost for electricity.
In an email, patient services director Lexie O'Shea said responsibility for maintaining the fish tank had shifted from the University of Otago's marine department to a ''local pet retailer'' for the tank's second year.