Your Congo Tetra Vet-Prep Sheet
Finfern honest freshwater care · finfern.com 🔍 Find an aquatic / fish vet — before you need one
- Search the WAVMA aquatic-vet finder (the World Aquatic Veterinary Medical Association) — or search "aquatic / fish / exotics vet near me".
- Call ahead and ask the key question: "Do you treat fish?" Few vets do — and ask the exam fee while you're on the phone.
- Find and save one now, while things are calm — not in the middle of a crisis.
📇 Fill this in now — before the crisis
Two minutes now saves ten in a panic. Print it and keep it by the tank.
🚨 Is this an emergency now?
Act promptly — starting with a water test — if you notice any of these:
- Males failing to develop fins or colour, or losing colour they had — the profile links this directly to sub-standard water quality; test and improve water quality and check softness/pH first.
- Constant skittishness, hiding or crashing into décor — often too small a group or too-boisterous tankmates for a shy shoaling fish; increase group size and reassess tankmates.
- Ragged or shortening fins on males — suspect fin-nipping tankmates (or aggression) rather than assuming disease; remove or rehome the culprits and keep the tank calm.
When in doubt, a vet call is never wrong — most issues are reversible if caught early.
🚗 On the way / while you wait
✅ Do
- Test your water NOW — ammonia, nitrite, nitrate, pH and temperature — and correct the obvious (a big source of trouble is ammonia / nitrite).
- Keep the fish in its own stable, dechlorinated tank water.
- Move it to a hospital / quarantine tank if you already have one set up.
- Keep the tank calm and dimly lit — stress makes almost everything worse.
⛔ Don’t
- Don’t tip in OTC, aquarium-shop or forum “cures” blindly — many are harmful or just mask the real problem.
- Don’t make a big sudden water change or swing the parameters.
- Don’t add salt or medication without knowing the cause.
🎒 What to bring
- A recent water-test result — ammonia, nitrite, nitrate, pH and temperature. Water quality is the root of most fish illness and the first thing a fish vet asks about.
- Clear photos and a short video — it may not show the behaviour or symptom in the clinic.
- A note of your setup and exactly what — and how often — you feed.
- Only if the vet advises transporting the fish: the fish in a bag or tub of its OWN tank water.
🗣️ What to tell the vet
A general vet may not know this species. Come ready to explain its correct care:
- Temperature
- 23–28 °C / 73–82 °F
- pH
- 6.0–7.5 (acidic side of neutral, soft water)
- Hardness
- 3–18 dGH
- Minimum tank
- ~108 L / ~29 US gal — a 120 × 30 × 30 cm base for adults, per SeriouslyFish
- Filtration & flow
- Soft, acidic-of-neutral water with good circulation; sensitive to poor water quality
- Diet
- Omnivore — dried food plus a good proportion of live/frozen for best colour
- Tankmates / temperament
- Peaceful but shy; its size and activity can unsettle timid nano fish
⚕️ Most fish illness starts with water quality, not infection — bring a recent water test; it's the first thing a good fish vet will ask about. Fish medicine is specialised and few vets treat fish, so call ahead. Many aquarium-shop and OTC 'cures' are harmful or simply mask the real problem, so tell the vet exactly what (if anything) you’ve already added, and treat a sick fish in a separate hospital tank rather than dosing the whole display.
Then note which of the warning signs (above) you are seeing, when they started, and whether they are getting worse.
❓ Questions to ask
- Do you treat fish? If not, can you refer me to a vet who does?
- What are the likely causes — and could my water or setup be the cause?
- What is the treatment plan, the likely cost, and what should I watch for at home?
- How do I prevent this from happening again?