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Article #305: Common Diseases In Your Fish Tank

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Here's a very quick summary of symptoms penicillin and tetracycline.
and information about the most common - Cottony white substance appearing on
diseases that can affect our gilled surface injuries or mouth
friends – there's lots more Common fungal infection; exacerbated by
information available online and in poor water conditions and/or "tank
books: bullies" which cause injury to other
- Red or bleeding gills fish. Correct water chemistry and treat
A sign of incurable ammonia poisoning, with an aquarium fungicide.
usually caused by a new tank that doesn't - Small white granules or pimples, mostly
have a nitrogen cycle going yet, or an on the fins
old one that's lost its beneficial This is the dreaded "Ich", or
bacteria. There's not much you can do Ichthyophthiriasis, an infestation of
for these fish, unfortunately; educate parasites. It's difficult to treat
yourself about biological filtration and because the protozoans can only be
try again. destroyed after the pimples break open,
- Spots or streaks on the body which and they often mature enough to infect
appear red or orange other fish before tank treatment is
- Fungus-like growths, or a white or gray complete. There are a handful of
film on the body. medications and preventive treatments
- Dropsy (bloating) available in stores; read instructions,
Evidence of various bacterial disorders. use quarantine carefully, and ask for
Salt baths, or antibiotics such as advice from fish store employees and
tetracycline, penicillin and naladixic fellow hobbyists about your particular
acid can be used to treat affected fish tank situation.
in a separate hospital tank. Remember - Black patches on the body and fins,
that the antibiotics will kill your good with or without body swelling
bacteria too – don't add them to This is a myxobacteriosis infection,
your main tank water! uncommon but easily medicated. Commonly
- Tiny black specks on the body caused by overcrowding and poor water
A sign of "Black Spot" or quality.
diplopstomiasis, an infestation of - Powdery white speckles on body skin
parasite larva. Medications are readily Velvet, or oodinium, is a parasitic
available at any fish store. disease similar to Ich, but easier to
- White or gray film on the eyes treat with commercial medications. Often
Cataracts happen when fungus grows on the caused by chilling or transportation
eyes – it happens most frequently stress.
when your water is high in ammonia or - Visible worms, flukes or lice on the
nitrates. Correct water chemistry and body
treat with an aquarium fungicide. Simple parasitic infestation. Remove
- Bulging "pop" eyes from tank, physically remove visible
Corneybacteriosis usually happens when parasites, and treat with commercial
poor water quality is caused by medications. Follow instructions
overcrowding. Remove some fish to a carefully; lack of follow-up treatment
separate tank, correct water chemistry, may cause re-infestation or fungal or
and treat sick fish with antibiotics like bacterial infections.






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