wow, that tank is incredible! nicely done man! what do you plan on doing for the top? canopy? netting? suspended lights? you can probably take note of what they do at a lot of public aquarium displays as far as tops go for such a large enclosure...i have seen setups that have no top, but unless you have backups for all your gars when (not if) they jump, i would implement a plan.
looking forward to further progress, nicely done!--
--solomon