53 gallons tank, 2x 36w
To have a big aquarium.
Xiphophorus maculatus, Poecilia reticulata, Poecilia sphenops, Ancitrus, Corydoras paleatus and others
Cryptocoryne, Elodea, Pistia stratiotes, Vallisneria,
Vesicularia dubyana, Riccia fluitans, Ceratophyllum demersum, Alternanthera, Ludwigia repens, Hydrocotyle leucocephala, Hygrophila polysperma, Echinodorus 'Ozelot' (Green).
Everything will be allright.
When you see signs of stress in your fish, you can then take steps to identify the source of that stress and then to resolve it before it becomes a major issue.
If you're looking for a unique way to stock your new tank, give freshwater shrimp a try.
If your fish is suffering, you may want to consider euthanasia as an option to humanely end his pain.