People with experience applicable to what you are planning likely work with Siamese Fighting Fish. They have the frequent massive water changes.
Water quality will be an issue unless you keep stocking density low or have some sort of filtration to remove metabolites. Simply flushing with new water every 24 hours will not be adequate. You will have to work hard to make certain feed you make is good. No mention of vitamins was given.
Could you employ a third tote?
In saying removing metabolites I assume you mean biological filtration. This could be achieved using two large fluidized bed sand filters. To handle waste build up I was thinking of doing a drain in the center with pumps on the perimeter to create a more pronounced drain effect pushing waste to the center where it simply goes out the drain. This alone will reduce the biological filtration needed as there will be less waste to break down. Adequate gas exchange at the surface can be achieved through the water movement from the pumps and water constantly trickling into the vat.
I have found that you can provide adequate vitamins by being selective in the ingredients used in the food. Whole fish meal provides the B Complex. Vitamins A, C and K are provided in the kelp. Vitamin D is provided by the sun. The food part of this project is the only part that I have a firm grasp on to be honest.
I can add as many totes as needed.
