So it seems your aquarium is just a wonderful and BEAUTIFUL (and super well crafted) floor aquarium (see my globes on Chinese stand). (my dream tank would have been like the coral pond type floor tanks). But since you asked and I had former horrific noise issues with former NYC apt he...
Myriophyllum, Ceratophyllum... would work> It hadn't occurred to me that the use of media would protect the breeding fish. <Oh yes... easier to be driven into than the pond edges> In re: culling the herd: To those who plan to do that: Don't name your fish. Then...