I saw bright red blood for quite a while and thought it was from the UC. Turned out to be from hemmies.
Still see blood from time to time but it's always the hemmies reminding me that they are irritated.
Oop's, just noticed that you said the blood is "darker" in color.
Could be coming from higher up in the digestive tract. Probably should mention it to your GP or GI.
Sorry about that.