My Guppy Has A New Black Spot?

So of course it's my favorite guppy, who now has a large black spot on one side of them.



Its the one right on his side, it wasn't there in the past I just noticed it a bit ago. I was wondering of he is hurt, its a medical issue, or its normal and just weird. XD Please help, I am trying to breed him, he is my favorite.

 

Can you take a higher quality photo?

Also, what is your ammonia, nitrite, nitrate, pH and temperature?

 

Can you take a higher quality photo?

Also, what is your ammonia, nitrite, nitrate, pH and temperature?

I will try to take a better picture, and I have been meaning to get PH strips and other testing stuff, but I did just put them in a new tank that has dirt substrate unlike their old one, but its been over a week since the switch. Its gone... I just went to take a picture and the spots poof

 

I will try to take a better picture, and I have been meaning to get PH strips and other testing stuff, but I did just put them in a new tank that has dirt substrate unlike their old one, but its been over a week since the switch. Its gone... I just went to take a picture and the spots poof

Dirt substrate will leech ammonia and other organics for several weeks, and without lots of live plants to soak up all that stuff the water can get toxic pretty quickly. Are you using actual dirt capped with gravel or something like ADA Amazonia?

 

My guppys from *cough* petsmart, all did the same. Many turned different colors and got lots of black spots. It was cool and harmless.

 

Dirt substrate will leech ammonia and other organics for several weeks, and without lots of live plants to soak up all that stuff the water can get toxic pretty quickly. Are you using actual dirt capped with gravel or something like ADA Amazonia?

Its mostly gravel with spots of buried dirt in places I have plants growing. So it should be ok...

 

Its mostly gravel with spots of buried dirt in places I have plants growing. So it should be ok...

Without having a way to test your water you can't be too sure. I'd take a water sample to an LFS or invest in a liquid test kit.

 

My guppys from *cough* petsmart, all did the same. Many turned different colors and got lots of black spots. It was cool and harmless.

Thanks, its just Ive had them for months and there was no change till now, *shrugs*

 

Without having a way to test your water you can't be too sure. I'd take a water sample to an LFS or invest in a liquid test kit.

Thanks, I should be able to buy some basic water testing stuff at the store, Ill post an update when Ive tested everythung.