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Comment by Jon Nose on July 2, 2011 at 6:36pm

Thank you for the input ... knew I had to reinforce ... but hadn't got around to getting the details ... gravel beds are 12 inch ... bottom raft system 24 inch  central tanks 28 inch and one 36 inch ....

Will be digging outside tanks down about 12-15 inched into ground (surrounded by some pvc liner)

rear tanks will also be dug down ...theory is to have the big blue tank feed gravel beds ... and small blue tank tie into raft beds and pumped to fish tanks and nft system ....

Comment by David Waite on July 2, 2011 at 6:27pm

Jon when you fill the bottom grow beds with water you will need a 2x4 in the middle to stop water pressure from bowing the 3/4 ply. We use alot of 3/4 in forming and when you go above 18 in it really bows without support. We turn a 2x4 sideways to the ply and stake and that works great. Just a thought.

Comment by Jon Nose on July 2, 2011 at 6:22pm

fish will be in middle row .... float beds under the gravel beds ( with some prawns, shrimp, etc)... plan on a nft system in the middle and right rows ... should give me about 1000 sq feet of growing area ..... time will tell

Comment by David Waite on July 2, 2011 at 6:11pm

Jon your system is interesting. Lots of large reservoirs for fish underneath looks like. You will need more beds hehe.