Abstract
Most strange things in a shrimp tank are not diagnosed by name first. They are diagnosed by location, shape, movement, risk, and shrimp behavior . A white worm on the glass, green fuzz under a shrimp, tiny white dots in the water, and a white ring around the body all point to different problems. Some are harmless microfauna. Some are parasites or infections. Some are water-parameter warnings.
The safest rule is simple: identify before treating. Take a clear photo or video under white light, check whether the organism is on shrimp, glass, plants, substrate, or dead tissue, then test ammonia, nitrite, nitrate, GH, KH, and TDS if shrimp are stressed or dying.
A shrimp keeper once sent a blurry video and asked, “Is my whole tank infected?” The tank showed white dots on glass, a dead shrimp, and one shrimp with a pale mark near the head.
The answer was not one disease. It was a diagnosis path.
Start With Location
If it is on glass, plants, or hardscape, think hydra, planaria, biofilm, copepods, seed shrimp, or detritus worms.
If it is attached to a live shrimp, look more carefully. White hairs near the head may suggest Scutariella. White fuzz on the body may suggest vorticella-like growth. Green stringy growth under the belly may be Clado, not eggs.
If it is on a dead shrimp, remove the body first. Growth after death may be decomposition, not the cause of death.
Quick Identification Rules
Hydra attach to surfaces and extend tiny tentacles. They may threaten baby shrimp.
Planaria glide on glass or substrate and often have a flat body with a triangular head. Detritus worms are thin, thread-like, and wiggle.
Copepods move in quick jerks. Seed shrimp look like tiny oval moving dots. These are usually harmless and often increase after overfeeding.
Biofilm on new wood is often normal. White fuzz on leftover food is decay and should be removed.
Green fuzzy material under a shrimp may be Clado if it looks like algae strands. Neat round beads under the belly are more likely eggs.
A white ring around the shrimp body is usually molting failure, not a contagious disease. Check GH, KH, TDS, temperature, and recent water changes.
What to Do First
Do not medicate from one blurry photo. Reduce feeding, remove uneaten food, siphon debris, and observe shrimp behavior.
Test water if shrimp are hiding, twitching, failing molts, or dying. Ammonia and nitrite should be 0 ppm . For shrimp tanks, unstable GH, KH, or TDS can be just as important as visible pests.
Isolate affected shrimp when growth is attached to the body, head, gills, or underside. Remove suspicious molts during parasite issues.
Practical Rule
Use this order: location, shape, movement, shrimp behavior, water parameters, then treatment . Observation is enough for many harmless microfauna. Isolation or shrimp-safe treatment is only needed when the risk is confirmed.
FAQ
Are all small worms in shrimp tanks dangerous?
No. Detritus worms and many microfauna are usually harmless. Planaria are more concerning, especially in breeding tanks.
Should I treat hydra immediately?
Only if hydra are spreading or baby shrimp are at risk. First reduce feeding and remove visible hydra if possible.
Is white fuzz always fungus?
No. It may be biofilm, decay, vorticella-like growth, or decomposition on a dead shrimp.
What should I test when shrimp look sick?
Test ammonia, nitrite, nitrate, GH, KH, and TDS. Water instability often looks like disease from the outside.
