Hi paw paw.
you haven't given your location. Do you live in australia? If so, check
Here...this place is great.
if not, some plants that are considered native to Aus (although may be found elsewhere too) are:
Australian Native Plants
Aldrovanda vesiculosa "Water Wheel Plant"
Ammannia baccifera "Daly River Ammannia"
Aponogeton euryspermus "Red Lace Plant"
Aponogeton tofus "NT Lace Plant"
Aponogeton vanbruggenii "NT Lace Plant"
Azolla pinnata "Azolla pinnata"
Blyxa aubertii "Blyxa"
Butomopsis latifolia "Butomopsis"
Ceratophyllum demersum "Hornwort"
Ceratopteris thalictroides "Water Sprite"
Elatine gratioloides "Waterwort"
Eleocharis caespitosissima "Anopheles Creek Hairgrass"
Eleocharis geniculata " Coomalie Creek Hairgrass"
Eriocaulon setaceum "Eriocaulon setaceun"
Glossostigma diandrum "Small Mud Mat"
Glossostigma elatinoides "Mud Matt"
Goodenia purpurascens "Goodenia purpurascens"
Hygrophila angustifolia "Willow Hygro"
Isachne confusa "Isachne confusa"
Lemna aequinoctialis "Duck Weed"
Limnophila aromatica "Limnophila aromatica"
Limnophila australis "Moyle River Ambulia"
Limnophila brownii "Darwin River Ambulia"
Limnophila chinensis "Limnophila chinensis"
Limnophila fragrans "Limnophila fragrans"
Lindernia tenuifolia "Lindernia tenuifolia"
Maidenia rubra "Maidenia"
Marsilia drummondii "Marsilia drummondii"
Marsilea hirsuta "Hansen's Nardoo"
Microcarpaea minima "Microcarpaea minima"
Mimulus uvedaliae "Mimulus uvedaliae"
Monochoria australasica "Monochoria australasica"
Monochoria vaginalis "Monochoria vaginalis"
Myriophyllum dicoccum "Howard River Milfoil"
Myriophyllum muricatum "Berry Creek Milfoil"
Najas tenuifolia "Najas tenuifolia"
Nelsonia campestris "Nelsonia campestris"
Nymphaea elleniae "Jardine Lily"
Nymphaea nouchali "Nymphaea nouchali"
Nymphaea pubescens "Nymphaea pubescens"
Nymphaea violacea "Nymphaea violacea"
Nymphoides crenata "Nymphoides crenata"
Nymphoides indica "Snow Flake Lily"
Nymphoides minima "Nymphoides minima"
Nymphoides spongiosa "Nymphoides spongiosa"
Ottelia alismoides "Ottelia alismoides"
Pogostemon stellatus "Pogo"
Potamogeton crispus "Curly Pondweed"
Potamogeton javanicus "Potamogeton javanicus"
Potamogeton tricarinatus "Potamogeton tricarinatus"
Rotala occultiflora "Rotala occultiflora"
Rotala mexicana "Rotala mexicana(red)"
Rotala mexicana "Rotala mexicana(green)"
Schoenoplectus litoralis "Daly River Club Rush"
Spirodela polyrhiza "Giant Duckweed"
Staurogyne leptocaulis "Staurogyne leptocaulis"
Utricularia gibba "Bladderwort"
Vallisneria caulescens "Branching Val"
Vallisneria nana "Native Val"
Vallisneria triptera "Vallisneria triptera"
Wolffia angusta "Wolffia"
What type of Pseudomogil are you getting? The type of plant you get would depend on which creek systems the fish inhabit for a true biotope.
hope this is of some help.