How about this for the inside of a plywood raceway? It's long enough for a 16 foot raceway that is 2 feet deep up to 5 feet across. $100.00 would do it. On sale until the 15th.

http://www.menards.com/main/building-mat...g/p-1382672.htm

If you want to go the route of a circular stock tank you many be able to find one really cheap on Craig's List. Sometimes people just want to get rid of them. Plastic would be better but if you have to paint something with an epoxy AES's Sweetwater primer and paint would be the way to go. You could also use it in lieu of a liner.

I use a stock tank that I have elevated on concrete blocks for one of my RAS tanks.



No offense to some of the aquaculture suppliers but their mark ups are shameful, and when they tell you the above liner is not safe for fish it's an outright misrepresentation. The ones I bought from Menards have printed in white lettering: "Safe for aquatic use."

Last edited by Cecil Baird1; 04/12/12 08:12 PM.
If pigs could fly bacon would be harder to come by and there would be a lot of damaged trees.