Fish Health Sheet – Important Information to give Before Asking Questions

Diseases can be one of the most frustrating and confusing aspects of fishkeeping, and sometimes you’ll have to ask others for help. To make it easier, it’s best to give as much information as possible so others can help you quickly and efficiently.

The Basics

What's gone wrong, exactly. Symptoms include anything you've noticed about your fish. This could be: External, such as fluffy patches, ulcers, wounds, discolouration, spots, parasites, eye problems, or even what their poop looks like. Internal, such as a sunken belly. Behavioural, such as not eating, hiding away, bumping into things, darting and anything out of the ordinary. 


Affected fish (is it a single sick fish, or the whole tank, any deaths) 

How long have you had the affected fish

Recently introduced fish or other livestock (and how long ago was it introduced, were there any sick fish in store)

Recent changes (have you made any changes to the tank, what were they and when were they changed)


Tank Size

Tank Stocking (the types and amounts of fish and other creatures living in your tank)

Food regime (what foods do you feed and how often)

Filter model (and do you clean it; if so, how thoroughly and how often)

Tank flow (does the water move fast, or does it sit still)

Have you attempted any medications (if so, what type, for how long and was it in the main or quarantine tank)


Anything to do with water chemistry and water quality: For this you will need a thermometer and a reliable test kit (liquid test kits preferable as test strips tend to be inaccurate). If you don’t have a test kit, a local pet/fish store should be happy to test your water for free. Water softness can be taken from your local water reports (or may be measured with a test kit).






GH/KH (water softness, don’t worry if you don’t know these, but they can be useful)