Should be about 16 tons when done including filter. It replaces a 8 ton whose inhabitants almost all died on the second day of CNY when a catering worker turned on the wrong tap and let tap water pour in undetected for several hours. There was only one survivor, a 8yo kohaku who is now residing in my neighbour's communal pond.
Going to use all the latest aquaculture technology...
Rotary drum filter, brushless programmable DC pumps and a custom made Bakki (Zakki) shower. Water supply will be filtered full time with 100kg of Calgon centaur catalytic carbon. Not chancing another chloramine poisoning event.