What's eating my hydrocotyle tripartita?

Hydrocotyle tripartita, a delicate aquatic/semi-aquatic plant, is most troubled by aphids and spider mites when grown emersed, and by snails in aquarium or pond settings. Snails rasp holes through thin leaves overnight. Inspect new plant additions before introducing them and remove snails by hand or with snail traps.

Ragged holes and missing sections in thin, round leaves; slime trails visible on foliage Remove by hand at night or use copper tape barriers; avoid introducing snails via new plants or untreated water

Clusters of tiny green or black insects on new growth; sticky honeydew residue and distorted stems Blast off with a strong water spray; apply insecticidal soap or neem oil to emersed growth

Fine webbing on leaf undersides; leaves develop a pale, stippled appearance and may yellow Raise humidity, mist regularly, and treat with diluted neem oil or a miticide on emersed portions