Hi,
You can try the following:
Hygrophila difformis (personally I think it is not a very nice looking plant), Blyxa Japonica (it will grow into a nice lush bush if given enough time and nutrients) or Echinodorus Quadricostatus (reported to be fast growing)
Why do you need huge plant mass? Suggest you think about the 'exit strategy' as well - how easy would it be to removing the plants when you do not want them anymore.
Can consider some floating plants as well, such as Water hyacinth?










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