hi chrisg
welcome to the forum....
the black spots, do they look more like freckles and scattered like pepper?...if yes it is the coloration predominately with pigeon blood hybrid strain and is not a dieases. chances likely it will stay with them forever.
As for the fighting and chasing, this is also a common trait amoung cichlids and are forming their social pecking order and out of the six, one dominate(alpha)discus will emerge, and there will also be one that will end as the butt that gets kicked around. This squabbling will be magnified especially when housed in small tanks.
the fish to water ratio for discus is 1 fish to 10 gallons of water...this means that with 6, it is advisable to house them in a 60 to 70 gallon tank with a tank length of 4 feet as a minimum guide. You can house them in a 2 feet but more often then not you will end up with lots of heartache see your discus trashing each other, and getting stunted due to insufficient space to grow.
As far as filter is concern, it will be good if a canister filter is used and if your decision is for a 4ft tank, than a ehiem 2228 or its equal will be good.
A discus normally pairs off when they are between one to one and a half years...size is not the concern as some adult discus may be small due to stunting. But if you must know, taking that stunting is not the factor, breeding size should be landing at 6 inches in diameter.
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