Jake,
i am currently in the process of building vats, for a specific purpose, and a height vs space vs lighting restriction has forced the issue with regard to tank depth. i am going to have 3 vats that are 8'x4'x1', stacked one on top of eachother on a custom made stand. i have a 7'5" ceiling, and orginally i was going to have a 6" opening between 4 vats but in the end i scrapped the 4th vat and i got 12" working space between the tanks. i need alot of surface area and it was tough decision to give up the 4th vat, but in the end i think this will work out alot better not to mention slightly less intial cost. i am hoping that with linked tanks the lack of water depth will be offset by the total water volume. i am springing for the 3/4" blondewood ( a whopping 1 dollar between 1/2" and 3/4") and 10oz (in 50" width!! single span!!) with some 4oz fiberglass, and marine epoxy. i need durable tanks that wount leak that will last the test of time. i have found your posts very inspiring. i was very edge of going for broke or checking myself into an instution and after reading this thread,.(insert boring detail).. well here i am. my fiance and i are going to be investing in property soon, and once i have a green house or garage facility, i will be revising my plans (read adding tanks). I think the extra room and depth provides alot of possiblity, and stability. i am a firm believer in not cornering one's self, and the depth can add a varity of options for minimal extra cost. i have found in my personal experience that the longer the wood the less true it is, and would think twice about going the 16' length with 2x6's. this could be finessed however with some thought. the multiple tanks could allow different species (lps and sps) to be done at the same time without inhibiting eachother (ie chemical warefare), and or allow a redundancy if something were to happen. i am going to build a vat exactly like the link i provided for my shark and use pondliner also, at the new property. it cheap as beans compared to wood, glass, and epoxy, but i didnt want to have to deal with making bulkheads not leak, pinholes, ect, without having a floor drain and being in my own place (im currently renting). the pondliner is tough as nails though, on the thicker stuff 40 - 60 mills, you supposdly cant put a shovel through it. im located in florida and lowes is more than "the depot" = homedepot. i dunno who hp is tho.? the deeper tanks allow for better implimation of airlifts someting that i strongly advocate. i wish i was closer to tropicorium, and may visit there facility in the near future. i may find a way to visit ora, they let a miami based aquarium club tour their facility.. i missed that opportuinty big time. i am currently looking into the state certified aquaculture license and hopefully will get that ball of wax going shortly. i will keep you posted as soon as i can and am listening at the same time. thanks for your input jake (and everyone on this thread!!!) it was the push that i needed. in the end i dont really care if i make it or not, i have a dream and i am going for it. i hope my determination will over come the odds but at the end of the day i followed my dream and for me that is enough.