Anyone in W.A. who is looking to make themself a cheap system, I have just had a load of 200l drums delivered this morning, and they were quite cheap. Also the guy who supplied them has a number of the 1000 litre square bulkabins available. Ones with broken valves on the bottom are only $50 each and if your using it as a fish tank then you probably don't need the tap on the base of it anyway...
Ohh, the outlet where the broken valve was, has been capped off with a plug and the old valve removed..
Very cheap for a 1000 Litre fish tank....
If your interested, PM me and I'll give you his contact details.