How do you have Nitrates if the tank isnt cycled?
Are you just assuming? 4 days u still dont even have the 1st bb that converts amm-->nitri! Id do a w/c every 2-3 days at a 20-25% depending on ur amm levels!
And you "orange" color is coming from your tan gravel thats obviously un-washed! Thats the dust crap in ur water, carbon will clear it up along w/ w/c but be careful not to over do it as prolonging the growth of ur bb is no good!
GL
#1 S. Vettel