Fish recommendation for 40 liters aquarium

[Ghraise]

I have a 40 liter tank and the water temperature is usually between 24-28°C. The water hardness is 50 FR. I want to keep only one sex of fish to avoid breeding. Can you suggest a peaceful species that can live in these conditions?

 

[Colin_T]

What are the tank dimensions (length x width x height)?

Which part of the water hardness is the 50FR for?
What is 50FR in ppm?

Ideally we would like the carbonate hardness (KH), general hardness (GH) and the pH of the water.

 

[Ghraise]

What are the tank dimensions (length x width x height)?

Which part of the water hardness is the 50FR for?
What is 50FR in ppm?

Ideally we would like the carbonate hardness (KH), general hardness (GH) and the pH of the water.

Dimensions of the tank: Length 43, Width 28, Height 34. Hardness of 50 FR mains water. PH of the water is 7.2. I don't know about the other questions.

 

[Essjay]

It's the hardness that is confusing us. What is the unit "FR"? I know there are several units for hardness but I do not recognise FR.

@emeraldking Do you know what 50 FR means for hardness?

 

[Ghraise]

It's the hardness that is confusing us. What is the unit "FR"? I know there are several units for hardness but I do not recognise FR.

@emeraldking Do you know what 50 FR means for hardness?

The French unit I am referring to is abbreviated as F, FH or FR. 1 fh° = 10 ppm

 

[Essjay]

Thank you, that helps a lot

If 1 FR = 10 ppm that means your 50 FR = 500 ppm and 28 dH which is extremely hard. To be honest I'm not sure which fish can live in such hard water. Hopefully members who have hard water will be able to suggest fish which can live in very hard water.

 

[Ghraise]

Thank you, that helps a lot

If 1 FR = 10 ppm that means your 50 FR = 500 ppm and 28 dH which is extremely hard. To be honest I'm not sure which fish can live in such hard water. Hopefully members who have hard water will be able to suggest fish which can live in very hard water.

Yes, I am aware of that too, but I have been keeping 1 goldfish, 5 cory catfish and a bushymouth catfish in this water for about 3 years. I have not encountered any visible problems so far.

 

[Naughts]

Wow that's really hard water. If you still have the cories and catfish consider using RO water because the minerals will build up in their organs and shorten their lives.
There are a couple of suitable hard water fish in this thread but most need a bigger tank than 40l:

10gal planted setup for hard water fish

Apparently a feller in the next street from me has Pygmy swordtails. Just found this out today. I’d imagine his water would be similar to mine 340ppm and 19dh. I know nothing about them.

www.fishforums.net

 

[Ghraise]

Wow that's really hard water. If you still have the cories and catfish consider using RO water because the minerals will build up in their organs and shorten their lives.
There are a couple of suitable hard water fish in this thread but most need a bigger tank than 40l:

10gal planted setup for hard water fish

Apparently a feller in the next street from me has Pygmy swordtails. Just found this out today. I’d imagine his water would be similar to mine 340ppm and 19dh. I know nothing about them.

www.fishforums.net

Thank you for help.

 

[CassCats]

Mix a tiny little bit with RO to bring the GH down to 400ppm and you could keep a species only setup of a pair of shell dweller cichlids

Neolamprologus multifasciatus — Seriously Fish

www.seriouslyfish.com

 

[MaloK]

How are the cats are doing ?

I mean... Your experience concurs with mine... They don't really care about any hardness levels to live.

 

[CassCats]

Food for thought regarding putting soft water fish into hard water that they did not evolve to live in:

Fish Reared in Hard Water are More Susceptible to Columnaris Disease : USDA ARS

USDA ARS Online Magazine Water Hardness Has Big Role in Fish Disease

For most people, the choice between soft and hard water for everyday use is a matter of preference or geography.

agresearchmag.ars.usda.gov

 

[Ghraise]

How are the cats are doing ?

I mean... Your experience concurs with mine... They don't really care about any hardness levels to live.

As I said, there is no apparent problem. But I will take the comments into consideration.

 

[Ghraise]

Mix a tiny little bit with RO to bring the GH down to 400ppm and you could keep a species only setup of a pair of shell dweller cichlids

Neolamprologus multifasciatus — Seriously Fish

www.seriouslyfish.com

Thank you.

 

[Colin_T]

The chart is confusing. Going across the chart, one side it says 1FH = 0.1ppm but going down it says 1FH = 10ppm

When I did 50 x 1.785 (the dGH number) it came up with 89.25ppm

I'm confused