Welcome to the Expanded Area of DrJohnson.com

Fish health is a complex and sometimes baffling subject. The key to relatively trouble free fish keeping is prevention rather than cure. This means providing optimum conditions that encourage good health. It is equally important  to nip minor problems in the bud before they get out of hand. Aimed mainly at beginners and intermediates, these key pages provide a 'core' understanding of the basics of fish health.

The importance of water quality

An overview of water quality - including the 5-point standard. Do you measure up?

Water testing for healthy fish

The importance of water testing. Look after the water and the fish will look after themselves (most of the time).

Fish are open systems

Fish are like leaky parcels of water swimming around in a pond or tank. No wonder water quality has such a dramatic affect on their well-being.

Fish disease overview

Fish disease is really no different to disease in any other animal. An overview of aquatic disease, diagnostic methods and treatments. Essential reading.

Fish health work-up

The essential fish health work-up. When fish are sick, you have two basic options. You can simply try and guess what's wrong (the most common method) and usually get it wrong. The alternative is a methodical, professional diagnosis. This is probably the most important page on the site - and the most essential stage in fish health treatment.

Fish disease treatments

Find out a little more about common treatment methods before you put any 'medications' into your pond or tank.

Using a microscope

The most essential tool for any serious fish keeper is a microscope. Indeed, without one it is impossible to make a full diagnosis of any fish health problem.

Biological filtration

Why do we use biological filters on ponds and tanks? This essential piece of equipment is often poorly understood.

New tank/pond start-up

New tank/pond syndrome kills tens of thousands of fish every year. Essential reading BEFORE you stock your tank or pond.

Fish keeping myths

Koi (or any other fish) popular fallacies. Common myths about fish keeping and fish health.

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Expanded Content by Dr. Erik Johnson, DrJohnson.com and Used with Permission; Frank Prince-Iles ©2009 All Rights Reserved