yes it is doable with a combination of solar and electricity
15,000l tank costs around 300 per month to run
set up about 6,500 dollars with some DIY skills
it may have marine white spot Cryptocaryon irritans
is it in quarantine
clean water and you might be able to ride it out
http://www.ultimatereef.com/articles/whitespot/
the search function at the top of the page brought up many bits of info
using NSW is alright, collecting and storage are mportant
you will need filtered water to adjust salinity with though