Troubleshooting
Cryptocoryne undulata problems — and how to fix them
Cryptocoryne undulata (Cryptocoryne undulata) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Crypt melt
Leaves melt after planting or chemistry changes. Leave the rhizome in place and keep conditions stable; new submerged leaves regrow.
Spreading into neighbours
Runners encroach on adjacent plants over time. Thin and replant offsets to maintain the layout.
Algae on old leaves
Slow growth under strong light invites algae; balance light with nutrients/CO2 and trim affected leaves.
Nutrient deficiency
Pale, weak leaves in inert gravel; add root tabs and chelated iron.
Prevent cryptocoryne undulata problems before they start
Most cryptocoryne undulata issues are care-mismatch, not bad luck. Dial in the basics:
Looking for cryptocoryne undulata in general rather than its problems? Read the full cryptocoryne undulata care guide — light, water, soil and feeding.
Cryptocoryne undulata problems — FAQ
Why is my cryptocoryne undulata crypt melt?
Leaves melt after planting or chemistry changes. Leave the rhizome in place and keep conditions stable; new submerged leaves regrow.
Why is my cryptocoryne undulata spreading into neighbours?
Runners encroach on adjacent plants over time. Thin and replant offsets to maintain the layout.
Why is my cryptocoryne undulata algae on old leaves?
Slow growth under strong light invites algae; balance light with nutrients/CO2 and trim affected leaves.
Why is my cryptocoryne undulata nutrient deficiency?
Pale, weak leaves in inert gravel; add root tabs and chelated iron.