Water Caltrop

Trapa natans

Plantae›Tracheophyta›Magnoliopsida›Myrtales›Lythraceae

📍 Europe and Asia

Unusual floating plant with diamond-shaped surface leaves and feathery submerged leaves. Historically important food plant in Asia.

Tank Mates

Otocinclus

Small, peaceful algae-eaters that won't damage delicate plant tissues and benefit from the shade provided

excellent

Neon Tetra

Peaceful schooling fish that thrive under floating plant cover and won't uproot or consume the plant

excellent

Amano Shrimp

Excellent algae control without damaging plants; they graze on biofilm and algae around the caltrop

excellent

Red Cherry Shrimp

Small, non-destructive shrimp that benefit from the shelter and won't harm the floating plant structure

good

Dwarf Gourami

Peaceful mid-water swimmers that appreciate the shade and cover without being aggressive toward plants

good

Java Moss

Excellent companion plant that creates layered habitat; both plants benefit from similar nutrient requirements

excellent

Common Diseases

Nutrient Deficiency

Symptoms

Yellowing leaves, stunted growth, pale coloration, particularly in older leaves

Treatment

Dose comprehensive liquid fertilizer weekly; test water parameters and adjust macronutrient supplementation based on deficiency type (nitrogen, iron, potassium, etc.)

Algae Overgrowth

Symptoms

Green or brown algae coating plant surfaces, reduced light penetration, plant decline

Treatment

Reduce lighting duration to 8-10 hours daily, perform regular water changes, introduce algae-eating fish or shrimp, manually remove excess algae

Root Rot / Decay

Symptoms

Mushy stems, foul odor, deteriorating submerged portions, plant collapse

Treatment

Improve water circulation with aeration, perform partial water changes, remove decaying plant material, ensure adequate nutrient levels and avoid stagnant conditions