Hornwort

Ceratophyllum demersum

Plantae›Tracheophyta›Magnoliopsida›Ceratophyllaceae

📍 Worldwide (widely distributed)

Hornwort is one of the most adaptable aquatic plants available, surviving in a wide range of conditions from cold ponds to tropical tanks. It requires no substrate and can float or be anchored. It grows rapidly, absorbing nutrients, and provides excellent cover for fry.

Tank Mates

Amano Shrimp

Will not damage plant tissue and help control algae on leaves

excellent

Red Cherry Shrimp

Peaceful shrimp that won't uproot or consume the plant

excellent

Otocinclus

Algae-eating fish that benefit from dense plant cover without damaging hornwort

good

Neon Tetra

Small peaceful fish that use dense hornwort as shelter and won't harm the plant

excellent

Dwarf Gourami

Gentle fish that appreciate plant cover; may nibble occasionally but generally compatible

good

Java Moss

Excellent companion plant that creates dense cover and shares similar care requirements

excellent

Common Diseases

Nutrient Deficiency

Symptoms

Yellowing leaves, stunted growth, pale coloration, leaf deterioration starting from older leaves

Treatment

Add comprehensive liquid fertilizer containing macronutrients and micronutrients; perform partial water changes to reduce accumulated waste; ensure adequate lighting

Algae Overgrowth on Leaves

Symptoms

Green, brown, or black algae coating plant surfaces; reduced photosynthesis; plant appears dirty or fuzzy

Treatment

Increase water circulation, reduce lighting duration to 8-10 hours daily, add algae-eating fish or shrimp, manually remove affected portions, perform water changes

Plant Decay (Rot)

Symptoms

Mushy stems, blackened or translucent tissue, foul odor, plant disintegration

Treatment

Remove affected portions immediately, improve water circulation and aeration, reduce organic waste through water changes, ensure adequate lighting, check for ammonia/nitrite spikes

Copper Toxicity

Symptoms

Leaf bleaching, stunted growth, tissue necrosis, plant death despite adequate nutrients

Treatment

Perform large water changes to dilute copper, avoid copper-based medications and fertilizers, use copper-free plant treatments, test water for copper levels