Newbie to freshwater tanks - Tropical Fish Keeping - Aquarium fish care and resources
 
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post #1 of 7 Old 07-28-2012, 09:47 PM Thread Starter
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Talking Newbie to freshwater tanks

Hi i'm new to fish keeping and getting a 40gallon tank. I have a PH of 7 and water with medium hardness. I was curious if i could mix guppies, mollies, and tetra.
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post #2 of 7 Old 07-28-2012, 10:51 PM
Welcome to the forum!
You'll find a bunch of friendly helpful folks here.

The short answer is they are all community fish and do pretty well together. Bear in mind that tetra's are shoaling fish that are most comfortable in larger numbers.
Go to the "Tropical Fish Profiles' (top of the forum page) for details on each fish.

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post #3 of 7 Old 07-29-2012, 08:04 AM
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Welcome to the forums.
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post #4 of 7 Old 07-29-2012, 08:44 AM
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Mollies and guppies need hard water and a ph preferably a little higher than that to thrive. Your water may work but you might want to try other fish.
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post #5 of 7 Old 07-29-2012, 12:30 PM
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Welcome to Troipcal Fish Keeping forum, and to the hobby.

Do you have a number for the GH (general hardness)? And the KH (carbonate hardness, or Alkalinity)? The latter will tell us what the pH may do, as it is normal for it to lower as the water acidifies, unless the KH buffers it. This info will help decide on fish. The water supply people can give you this info, maybe on their website.

As mentioned, the profiles give water parameters and other info for the species. Some are adaptable, some are not.

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 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]
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post #6 of 7 Old 07-29-2012, 02:44 PM Thread Starter
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PH is 7.2
Buffering capacity is 120
Total hardness is 50
Nitrite, nitrate and ammonia is 0
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post #7 of 7 Old 07-29-2012, 07:39 PM
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Quote:
Originally Posted by Jae9110 View Post
PH is 7.2
Buffering capacity is 120
Total hardness is 50
Nitrite, nitrate and ammonia is 0
The GH and KH must be ppm (parts per million), to make sense. So that equates to a GH of 3 dGH which is very soft. I would not try mollies, they must have much more calcium and magnesium mineral in the water. Guppy tend to be more adaptable but if it were me I wouldnot subject any livebearer to water as soft as this. The tetra will thrive, as will any other soft water fish.

The KH at 120ppm is roughly 7 dKH so that is going to buffer the pH a bit to prevent it lowering.

If you want some background reading on hardness and pH, have a read:
http://www.tropicalfishkeeping.com/f...quarium-73276/

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 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]
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