Ok been on a lot of these forums. Get alot of different answers. I am going to build a DIYT 48x30x30. want material would you all us and where can I get it at the best price?
Well not meaning to put you off your venture, I've never made a tank before myself but I will say that: The best and cheapest way to get a large tank is to read small ads papers or websites such as ebay. If you're patient you'll find a tank in your area and usually you are able get lots of other equipment thrown in. I also am not sure if I would trust a tank I built myself and wouldn't want all that water on the floor...
Not easy to do although I've built most of my own tanks, biggest being 48x24x24. I used laminated glass which is terrible to cut. You could use laminated, 10mm plate or acrylic but the cost of materials would be prohibitive (I get my glass FOC).
The easiest/cheapest way is 2nd hand in your local free ads paper Mac.