Can Hornwort and Red Ammannia Grow Together?

Hornwort and Red Ammannia share a workable water window around 22 to 28 °C, pH 6 to 7.5, and 2 to 12 dGH.

Both plants are comfortable in freshwater, so salinity is not a meaningful obstacle.

Flow is workable if the layout gives Hornwort gentle, low-flow water and Red Ammannia moderate flow.

The care split shows up in light or CO2. Hornwort wants low light and no added CO2, while Red Ammannia wants high light and recommended added CO2.

They naturally settle into different parts of the scape, which gives you more room to use each species for what it does best instead of forcing direct competition.

Hornwort reaches about 100 cm tall by 15 cm wide, while Red Ammannia reaches about 45 cm tall by 15 cm wide. Use those mature sizes for the layout, not the small nursery portions you bring home.

Shade is the biggest layout risk. If the taller or denser plant gets ahead, the other one can slowly decline even when water and nutrients still look fine.

Hornwort is typically free-floating with no substrate required and feeds mainly as a water column feeder. Red Ammannia is typically rooted in substrate with nutrient-rich substrate preferred and feeds mainly as a mixed feeder. That difference can make the pairing easier to arrange than two plants fighting for the exact same root or attachment zone.

Mature size is not the main thing working against this pairing, so normal maintenance is usually enough to keep the scape readable.

Hornwort brings fast growth, moderate maintenance, and beginner difficulty. Red Ammannia brings moderate growth, moderate maintenance, and intermediate difficulty. If one grows much faster, trim that plant before it starts making the other look like the problem.

The practical watch-outs are that one plant is much more light-hungry, so the scape will need placement and trimming discipline; and that shade becomes a real risk here, especially once the taller or broader plant settles in; and that their substrate preferences are different enough that rooted nutrition should be planned deliberately; and that growth pace and maintenance rhythm are uneven, so the stronger grower can dominate if pruning slips.

The strongest reasons to try the mix are that they share a workable temperature window around 22 to 28 °C; and that their flow preferences sit close enough to tune one layout around both plants.

Use this pairing when you are willing to manage the scape, not when you want a plant-and-forget combination. Start with more spacing than you think you need, then adjust once both plants show their real growth pace.

The simple success test is whether both plants still look healthy after the faster grower has been trimmed several times. If one keeps declining after routine care, the layout is probably asking too much of it.

This pairing is best treated as a layout decision, not just a water-parameter match. Hornwort and Red Ammannia can work together, but only when you intentionally manage spacing, shade, and maintenance so the stronger grower does not quietly turn the other into dead weight.