Ok, here goes...
I just got 4 botanicare 115 gallon reservoirs that are approximately 4ftx4ftx14.5in. In the next few weeks I'm going to pick up at least 8 more of them for a total of 12. I'd like to use a 1,100 gallon poly water tank as the FT. The FT can be found here and the GBs are in the pic below. IMG_20120119_123455.jpg
The plan is to use 3/4" limestone free river gravel as the media and set it up flood/drain. I'll probably put channel catfish in the system since they're native and inexpensive (and get big). It will be enclosed in a 18ftx30ft pvc hoophouse.
I am new to this but will try to post my progress as it develops. I welcome any and all questions, comments, and critiques


). It will be enclosed in a 18ftx30ft pvc hoophouse.
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I found a local source that has river gravel with no limestone in it and that's what I meant. I'm gonna get a bucketful this week and test to make sure. What do you feel will be the best way? Was thinking maybe fill a bucket half full w/ gravel and the rest with water, leave it for a week, and then do a PH test. I read somewhere you could pour vinegar on it too and it'd fizzle if it was too acidic. 