Tool question? - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 7 Old 10-21-2011, 09:34 PM Thread Starter
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Tool question?

Does anyone know of a tool or chart that shows fish compatibility and minimum tank size for each type of fish?

Thanks - love the forum,
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post #2 of 7 Old 10-22-2011, 12:09 AM
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look at the top of this page, says tropical fish profiles, has plenty of info....check it out, it may answer you questions.. good luck
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post #3 of 7 Old 10-22-2011, 12:15 AM Thread Starter
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Thanks. I did find this chart for the compatibility - Freshwater Fish Compatibility Chart - Rate My Fish Tank

Pretty useful, but it'd be nice if there was a tool or cart that not only told you compatibility, but also minimum tank size requirement. Seems like those are two of the big questions fish keepers need to answer before they commit.

The fish profiles certainly help out though. Thanks again.
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post #4 of 7 Old 10-22-2011, 12:21 AM
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post #5 of 7 Old 10-22-2011, 12:11 PM
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The problem with both linked charts is that they can only be very general. It is impossible to factor in all the variables.

Fish compatibility has to do not only with behaviours and numbers. The influencing factors include:

Tank size: first, water volume [many only think this when considering tank size]; second, its shape (whether it is a long or tall--a 20g long can house more fish than a 20g tall, and/or will be more or less suitable, depending upon species).

Filtration: not all fish will be "OK" with any filter, especially the water movement. Stress and even death can occur if filtration is not suited to the fish species.

Tank Environment: plants, wood, or rock are needed by some fish.

Light: Most fish need minimal lighting [floating ploants can achieve this], some need near-darkness.

Water parameters: temperature, hardness and pH. As one example, not all rasbora have equal requirements, yet they are indicated as compatible in those charts.

Behaviour: probably the best understood in most cases, but as the above hopefully shows, only one factor of several.

In my 20 years experience, the only way to assess true compatibility is to research each species and see what it requires in terms of the above factors. And these are all included in our profiles.


Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]

Last edited by Byron; 10-22-2011 at 12:13 PM.
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post #6 of 7 Old 10-22-2011, 01:27 PM
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I often refer to, which is good for a starting reference point, but always do further research based on their suggestions. I find it to be an extremely useful tool but for me, my main assumption is that it can err on the side of overly cautious due to its lack of consideration for whether there are live plants present.
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post #7 of 7 Old 10-22-2011, 09:27 PM
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Another wonderful tool for fish compatibility is the people on this forum. If you ask in the right forum, you will probably get what has and has not worked in the past.


Sitting by the koi pond

writings on fish and fishkeeping

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