Worried about my Honey Gouramis

[Wolfey]

Hey there, I hope you can help me.
So today I came home to find that some of my Honey Gouramis have developed a black stripe near their analfin this weekend as i was gone for 2 days. (They have been fed yesterday by my mother who knows how to feed fish etc.)
I know that they change color when ready to mate and they have been building bubble nests and also are defending them (at least one) I just want to be sure that it is really the problem and not something else like a disease...

Water perimiters:
PH: 7,2
CO2: 19
KH: 10
GH: 14
NO3: 25
NO2: 0
Temp: 24°C
Cl: 0

On the first two pics you can clearly see the black stripe and the last one (sorry for crappy quality he was a bit camera shy) is also developing a darker area around his head, he is also the one defending the nest.

 

[Colin_T]

There are no fish diseases that cause fish to develop a black line on their body or fins, so it's probably colouration and nothing to worry about.

 

[itiwhetu]

That is just showing his natural colours, you have a happy fish.

 

[Wolfey]

Thank you for your help, now im relieved

 

[Essjay]

That is normal male honey colouring. The black is not as pronounced as with the wild coloured variety but yellows still have a black throat.
Look at the first photo on Seriously Fish (wild colour) to give you an idea.

Trichogaster chuna – Honey Gourami (Colisa chuna, Trichopodus sota) — Seriously Fish

www.seriouslyfish.com

 

[Wolfey]

Thank you for your help, now im relieved

That is normal male honey colouring. The black is not as pronounced as with the wild coloured variety but yellows still have a black throat.
Look at the first photo on Seriously Fish (wild colour) to give you an idea.

Trichogaster chuna – Honey Gourami (Colisa chuna, Trichopodus sota) — Seriously Fish

www.seriouslyfish.com

Oh wow, i did not know that they got this black, thank you!

 

[W.R]

Also shocked me the first time my HG got a black tummy, but that shows it's maturing! now when it's time for breeding it's a possibility the black gets darker and once it calms down the coloration changes again, some fish keep the coloration forever

My dominant female also has some black on her bottom fin, but never on her throat.

 

[Wolfey]

Also shocked me the first time my HG got a black tummy, but that shows it's maturing! now when it's time for breeding it's a possibility the black gets darker and once it calms down the coloration changes again, some fish keep the coloration forever

My dominant female also has some black on her bottom fin, but never on her throat.

View attachment 121915View attachment 121918View attachment 121919

Thank you for your help!
I am also sure now that it is normal behaviour as I am also witnessing breeding behaviour in my Gouramis
I hope that they will breed, but for now I'm glad that they are happy and maturing!