Root Rot / Substrate Deterioration
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About this condition
A condition in which aquatic plant roots decay and plants decline or die due to anaerobic conditions developing within the substrate. Substrate clogging and prolonged lack of maintenance are common primary causes.
Common symptoms
- Leaves yellow and die from the base, with roots appearing black and rotten when pulled
- A hydrogen sulfide odor (rotten egg smell) may be detected from the substrate
- Planted stems pull out easily with little or no root development
- Overall vitality of aquatic plants in the tank declines and growth stalls
Common causes
- Organic matter accumulates in the substrate, forming anaerobic zones
- Substrate becomes compacted and clogged, reducing water circulation within it
- Long-term substrate use leads to nutrient depletion and pH shifts
- Overfeeding or excess fertilizer causing eutrophication within the substrate
Prevention (growing conditions & routine care)
Clean the substrate approximately once or twice a month with a gravel cleaner to prevent organic matter buildup. Plan to replace soil substrate roughly every 2–3 years, and choose substrate materials with particle sizes that resist compaction.
Related guide
→ Browse the species guide for this animalWhen to see a vet
Consider acting within a few daysWhat can a nursery or grower do?
Aquatic plant and horticultural specialty stores can assess the degree of substrate degradation and anaerobic zone formation, and provide specific advice on changing substrate type, appropriate timing for a tank reset, and methods to improve substrate aeration.
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- Ludwigia (Ludwigia aquatic plants) cultivation techniques | Cultivation management to bring out beautiful red coloring
Other problems with this plant
Algae OvergrowthConsider acting within a few daysLeaf Melting / Emersed-to-Submersed Transition FailureConsider acting within a few daysNutrient Deficiency / Leaf Yellowing and HolesMonitor; consult a specialist if it worsensStunted Growth / CO2 and Light DeficiencyMonitor; consult a specialist if it worsensHerbivore Damage / Fish, Shrimp, and Snail GrazingConsider acting within a few days