I definitely believe breeding largemouth bass in a aquarium is possible, with 125+ gallons, temperature slowly rising towards 70-80 degrees for a time in the year, find substrate like tiny river pebbles or sand to make a bed, plenty of diverse foods for nutrition, right lighting conditions, good water perimeters, and two healthy bass with opposite genders, you should be seeing some fry soon enough. I have a 125 gallon aquarium with a 1.6 pound bass and she is one of the most happy and healthy bass I’ve seen. I’ll be adding a male around the same size and I’ll update y’all if they spawn.