mollies and cory catfish question - Tropical Fish Keeping - Aquarium fish care and resources
 
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post #1 of 7 Old 09-12-2011, 07:01 PM Thread Starter
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mollies and cory catfish question

I know mollies need salt and have been told by some that cories can tolerate some salt and by others that they can't tolerate any. I would like to have both in my 55g. Would 1 teaspoon of salt be safe for the cories and enough for the mollies
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post #2 of 7 Old 09-13-2011, 01:17 AM
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I have mollies plattys guppies corys glass catfish gouramis and several other types of fish in a tank which is ever so slightly brackish, barely any salt. They can live in freshwater completely fine.
Make sure if your using salt, you use the aquarium salt, and follow the instructions to the letter, i always use less than stated if i was to use it, and i only use it to help with medication.
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post #3 of 7 Old 09-13-2011, 11:52 AM
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I would not use salt in freshwater aquaria. While mollies do occur in brackish water naturally, for some anyway, they can be healthy in fresh. And if soft water fish are included, salt should never be added to the aquarium (except as a treatment, but even then there are some fish for which this is not the best of treatments).

As you specifically mentioned corys, they are very sensitive to salt. Most of them occur in very soft water with no mineral content at all. The species that are found in coastal streams, such as Corydoras aeneus, are never found in any areas where there is a tidal influx of salt water. They avoid such areas completely. Which tells us that they don't like it.

I've written in previous threads on the specific detrimental effects of salt to fish and plants and won't repeat, but can if asked.

Byron.

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 youíre going to take it under your wing then youíre responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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post #4 of 7 Old 09-13-2011, 11:56 AM Thread Starter
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Salt in aquarium...

so your telling me mollies need "NO" salt added and will do just fine without it?
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post #5 of 7 Old 09-13-2011, 12:05 PM
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Quote:
Originally Posted by smit3183 View Post
so your telling me mollies need "NO" salt added and will do just fine without it?
Yes.

They do need medium hard (or harder) water, however. I think this is sometimes where the confusion sets in. Mineral salts (especially calcium and magnesium) that make the tap water hard are different from what we think of as common "salt" which is sodium (table salt, marine salt, aquarium salt). Mollies, and indeed all livebearers, must have medium hard water.

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 youíre going to take it under your wing then youíre responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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post #6 of 7 Old 09-13-2011, 12:09 PM Thread Starter
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ok..

thanks Byron.this should be no problem as my water is quite hard with a ph leve of between 8.0-8.4
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post #7 of 7 Old 09-13-2011, 12:23 PM
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Originally Posted by smit3183 View Post
thanks Byron.this should be no problem as my water is quite hard with a ph leve of between 8.0-8.4
That's fine.

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 youíre going to take it under your wing then youíre responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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