Finfern honest freshwater care

🩺 Your free vet-prep sheet

Your Black Neon Tetra Vet-Prep Sheet

Fish vets are rare, and it is easy to freeze in a crisis. This is the one page to have ready — how to find a vet, what to bring, what to tell them, and the questions to ask. Print it and keep it by the tank.

Black & white saves ink and prints cleanly on any printer.

Not sure it's a vet trip yet? Run the symptom checker or the water-parameter interpreter first — many worries turn out to be a water or husbandry fix.

Finfern honest freshwater care · finfern.com
Black Neon Tetra — Vet-Prep Sheet

🔍 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.

My fish vet
My black neon tetra
What I'm seeing

🚨 Is this an emergency now?

Act promptly — starting with a water test — if you notice any of these:

  • Fish gasping at the surface, hanging near the filter outflow, or suddenly lethargic soon after adding them: test the water for ammonia and nitrite immediately. Any reading above 0 ppm means do a water change and confirm the tank is actually cycled.
  • The shoal scattering, hiding constantly, colours washing out, or fins looking clamped: check for an oversized/aggressive tankmate, too-small a group, or a water-quality slip, and act on the cause rather than medicating blindly.
  • White salt-like spots, cottony patches, ragged or reddened fins, or rapid gilling: isolate stress and poor water quality first, then seek a knowledgeable fishkeeping source or an aquatic vet for guidance. These are triage cues, not a diagnosis.
  • Deaths after a water change: you likely swung temperature or chemistry too fast, or added unconditioned tap water; match parameters and use dechlorinator next time.
  • New arrivals refusing food for more than a few days: recheck water parameters and give them a calm, planted, dimly lit space; persistent inappetence with other symptoms warrants advice from an experienced keeper or vet.

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
20-28 C (68-82 F) is the tolerated range; aim for the community-tropical middle, roughly 22-26 C (72-79 F).
pH
5.0-7.5. A near-neutral, stable reading is fine; they mind sudden swings far more than any exact number in that band.
Hardness
Soft to moderately hard: about 1-12 dGH. They are flexible on hardness as long as it stays steady.
Minimum tank
Keeper-facing minimum: around 75 litres (about 20 US gallons). SeriouslyFish frames it as a tank with a base footprint of at least 80 x 30 cm (~72 L / ~19 US gal). You will see "10 gallons / ~38 L for six fish" quoted as a bare minimum, but that is a squeeze: bigger-is-better here because a longer footprint lets a proper shoal actually cruise and swim, which is when these fish look and behave their best. Prioritise swimming length over height.
Filtration & flow
Gentle to moderate flow. They come from slow, thickly planted margins, so aim for a well-filtered but not turbulent tank; baffle a strong filter outlet if the shoal is getting blown around.
Diet
Omnivore. A good-quality dried micro-flake or nano-pellet works as the staple, boosted with small frozen and live foods.
Tankmates / temperament
Very peaceful. A calm, well-mannered community fish that spends most of its time in the upper and middle water column.

⚕️ 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?