Shrimp or Otto damage?

[Brian Murphy]

Everytime my hydrophilia polysperma and limnophila aromatica get to a decent size to start trimming and enable them to start bushing out, either the amano shrimp or ottos take into the leaves over a few nights and ruin the whole plant to the point I have to cut the best bits off and replant putting me back to square 1. I have been giving them algae wafers since the last time it happened but doesn't seem to have stopped them. Any ideas to stop this from happening?

 

[Ryan Thang To]

definitely shrimp. when ever I put new plants in my shrimp goes for it.

 

[Michael W]

I can't say for the shrimp but I have no reason for it to be the Otto. Could it be a deficiency? I know hygros will grow like crazy therefore will need more of everything bar light for it to keep up with its growth. My reason being that you mention their growth rate is at a point where you would consider to trim the stems before something like this happens.