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As long as it is fully aquatic, it won't be toxic. Stay away from mondo grass, scarlet temple, purple waffle, violet, lucky bamboo, and another one I can't remember with golden in the name. Don't rely on petshop advice, as they frequently sell semi-aquatics as fully aquatic.
Some good plants for low-light, low-tech tanks:
- duckweed (floating plant, provides cover which bettas enjoy, multiples quickly)
- anubias (can be left floating or tied to something, broad flat leaves that bettas like to rest on)
- java fern (leave floating or tie to something, propogates by growing baby plants off its leaves)
- vallisneria (tall and grass like, bury the roots)
- hornwort (bury roots or leave floating, grows fast)
- ambulia (bury roots, grows fast)
- anacharis (bury roots, grows fast)
- bacopa (bury roots)
- wisteria (bury roots or leave floating)
- cabomba (looks like ambulia, treat the same, illegal in some places)
- java moss (tie to things or just spread over substrate to form a low-maintenance carpet)
- marimo moss balls (wierd, funny additions to a tank, just plop them in and leave them be)
Hope this helps. :) All of these will grow just fine with normal substrate (sand or gravel) and help with ammonia
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