Parrotfish turning black

[Cichlidsteve83]

I've noticed over the last couple of days, that my parrotfish is developing a black colour in certain areas on his body,mainly his belly, his mouth & even the fins!
I do regular water changes, haven't changed food!
Can somebody please tell me if this is normal or is he sick, his behaviour hasn't changed & he is eating!

 

[Cichlidsteve83]

All other fish are fine in the tank



You can just make out the black on the mouth & belly on the pic I've uploaded.

 

[Mogurako]

I would say it's normal mine did the same thing. You can see mine developed a couple spots and didn't adversely affect him at all.

 

[Cichlidsteve83]

Thanx for that, I'll just keep an eye on it, I read on a few other sites & it does seem to happen alot to them, most say its a sign of a growth spurt!

 

[Cichlidsteve83]

Ok so now he's stopped eating & seems to be gasping for air quite dramatically! As I mentioned before all other fish are fine! Please help!!