What Ariel said.
Mahirap magbigay ng ballpark figure kasi dedepende pa rin yan sa kaya mong ilaan na oras at effort sa tank.
Depende rin yan sa gusto mong ilagay.
Yung magiging itsura rin ng tank mo dedepende rin sa kaya mong ilabas na pera, during startup and the actual upkeep.
The only thing for sure is the cost will be bigger if don't have enough time and patience for your tank. And the more animals you keep (especially more demanding livestock) the more money you will need to maintain the tank.
Wag lang yung startup cost yung isipin mo. Marami kasi pasok yung budget para makagawa ng malaking tank for example, pero kakapusin ang budget para sa maintenance ng tank so nauuwi sa problema.
Hth