I am curious as to how you will be able to access all parts of your tank if it is 15' round. If your fish can get away from you it may be hard to harvest them. Also, growing multiple species in one tank can be problematic if they occupy the same strata...they will eat each other! I am also building a greenhouse just slightly larger than yours and will use the IBC tanks and the 8' round pools for easier access and they are cheaper. I will be growing multiple species but they will all be separate systems in 1 greenhouse. If one species gets sick or there are issues in 1 tank, I will not lose everything. Also, if you are planning on breeding crustaceans, even for freshwater species most will have to have a brackish water tank for spawning and the nymphs/larvae stage. I am not sure wicking beds will sufficiently clean the water with higher stocking densities, as the system will not completely drain the pool. That being said, you have some awesome plants in your vid and I bet that tomato was delicious. I have been researching this for 8 years and doing small scale experiments while waiting to build my greenhouse and system. The kids are through college and off the payroll so I can finally do it! I am excited to see you doing something on a similar scale and hope we all can collaborate and share so we will all be more successful. Great post.