Sweet, well I went to Bunnings today and got 2 25L containers and a 75L rubbish bin. I put a tap halfway down the bin. I went to the beach (where you specified on the map), and got 2 containers of water. It was beautiful and clear. I did a w/c with the seawater in my puffer tank, and their colours are really nice and bright, and they look really happy.
I don't have too much of a problem with the 25L, I can only carry 1 at a time, but my bf is nice about carrying the other one, so that's good. I figure it'll build up my girly muscles!
Thanks for the tips everyone!