Finfern honest freshwater care

🩺 Your free vet-prep sheet

Your Glass Catfish 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
Glass Catfish — 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 glass catfish
What I'm seeing

🚨 Is this an emergency now?

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

  • Fish hiding constantly, hanging listlessly, or refusing food: most often the group is too small or the water is off. Test ammonia/nitrite/nitrate and pH, do a water change, and consider whether the shoal needs to be larger.
  • A fish looking cloudy or milky, or its transparent body turning opaque/whitish: this can signal stress or illness - test the water first and seek advice; do not medicate blindly.
  • Rapid breathing (gilling), gasping at the surface, or the whole shoal darting/clamping fins: check temperature and flow, test for ammonia and nitrite, and check the water hasn't swung suddenly.
  • Sudden deaths soon after adding them: usually an immature/uncycled tank or a sharp parameter swing during acclimatisation - drip-acclimate slowly and only add them to a mature tank.
  • Be extremely cautious with copper-based medications - glass catfish are especially sensitive to them. If treatment is needed, research a fish-safe approach or ask an aquatic vet or experienced keeper before dosing.

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
20-26°C (68-79°F) per SeriouslyFish. In a planted community a stable ~23-25°C (73-77°F) sits comfortably in that range. They react badly to sudden swings, so a reliable heater and stable temperature matter more than hitting an exact number.
pH
4.0-7.0 in the wild (soft, acidic blackwater). In a typical planted community, aim for roughly 6.0-7.5 and, above all, keep it STABLE.
Hardness
Soft water: GH about 1-10 dGH (SeriouslyFish). They come from soft, slightly acidic streams, so very hard water is not ideal. (Some care sites quote "8-12 KH" - that is carbonate hardness, a different measurement, and should not be mistaken for GH.)
Minimum tank
Keeper-facing minimum for a small shoal: about 110-115 L / 30 US gal, with a base footprint of roughly 90 x 30 cm (36 x 12 in). SeriouslyFish lists 90 x 30 cm (~81 L / ~21 gal) as the smallest sensible dimensions; but because they need a real group AND open midwater swimming space, most keepers aim for ~113 L / 30 gal for six and add ~18-20 L (~5 gal) per extra fish. Bigger is genuinely better - swimming LENGTH matters more than raw volume.
Filtration & flow
Excellent water quality with gentle-to-moderate flow. SeriouslyFish suggests turnover around 4-5x tank volume per hour (e.g. a filter rated ~325-405 lph on an ~81 L tank), but diffuse the outflow - they come from slow-moving streams and strong current stresses them.
Diet
Carnivore-leaning omnivore (micro-predator)
Tankmates / temperament
Peaceful, timid and gentle. Not aggressive at all, but easily out-competed and stressed by boisterous or much larger tankmates. Prone to hiding, fading colour, and refusing food when unhappy - usually a sign the group is too small or the water is not right.

⚕️ 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?