New to Discus

[STHH]

Here's some updated pictures of the discus.
They have started their beefheart diet a few days ago, and i have to change water more often now, so often that my cories have started spawning, twice.

The most dominant yellow. Don't know why it is developing peppering. Does yellow have pigeon blood in them or should i be worried?
The ammonia, nitrites and even nitrates are still 0.


The other yellow seems to remain yellow without these peppering.


The Checkerboard with bluish fins


The checkerboard without blusih fins


Also bought a new fish.
Is this a Red turq?
It is being chased around and hides around my tiger lily all much of the time.

[Eddie]

Yes, the yellow is pigeon based. Could be dark from the surroundings. What color is the substrate? And yes, that is a Red Turq you posted in the last picture.