Ambition is wonderful! From a 29 gallon to a 600 gallon in one step! There would be a few problems, possibly the biggest would be keeping that long tank from bending in the middle. The floor under it would have to be very well framed and supported to avoid flexing under the load and the loads from the dozen or so people who could easily crowd around it. Then, you would need a bigger wallet than I have, just for the light - a kilowatt or so, not to speak of the number of plants required and the bags of substrate. Lastly, for me the impossible hurdle would be persuading the Missus that such an addition would be a decorating must. Oh, and the weekly pruning - set aside about 8 hours for that.