Red fern with big brown patch

[ZzyzxRiver]

I have a red fern macro that I think is thriving- the two fronds that I ordered have grown substantially and a third frond has appeared as well. However, the middle of the stem on the biggest frond is brownish/greenish. My cerith snails are regular visitors to this plant so I don’t think it’s algae—and the tip has continued to grow even after the discoloration happened. Any ideas? Sorry for the slightly blurry pic- taken from directly above.

 

[MnFish1]

I would watch.

 

[ZzyzxRiver]

Bump—anyone have macro insight for me?

 

[MnFish1]

Bump—anyone have macro insight for me?

First - can you perhaps send another picture (if you have a before and after picture - i.e. a picture from when the algae was healthy, compared to now?). I think the most logical explanation is that something may be eating it? Or its an in an imperfect area? What do you think could be the options?

 

[vetteguy53081]

I have a red fern macro that I think is thriving- the two fronds that I ordered have grown substantially and a third frond has appeared as well. However, the middle of the stem on the biggest frond is brownish/greenish. My cerith snails are regular visitors to this plant so I don’t think it’s algae—and the tip has continued to grow even after the discoloration happened. Any ideas? Sorry for the slightly blurry pic- taken from directly above.

Looks to be graciliaria or Rhodophyte species of Macroalgae but need sharper image to clearly see