Black spots every now and then

I got my RB parrot 6 months ago, hes about 4 to 5inches long now,he was pure orange when I first got him,no black marks at all,but time to time his fins will be tinted black with maybe some small spots on his head,what is this a sign of?,his mood or what?, Id appreciate some comments on this if you know what Im talking about.

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Re: Black spots every now and then

Black spots are a sign of stress. Could be water quality, over crowded tank, being bullied by another fish, diet, fluctuations in ph or water temp, not enough aeration. Basically, anything that can cause a fish stress. Start with your water parameters and go from there. Make sure your ammonia and nitrites are zero and your nitrates are 20 or below.