Stagnant Water from Reactor

[Reflective]

I just did a water change yesterday on my 220g and today I remembered that I forgot to turn the flow back on through my media reactor. So I turned it back on and the smell that came out of it made me realize I probably forgot since my last water change a week ago. The reactor holds maybe 2 gallons of water and the water that was in it has definitely mixed with the rest of the water in my tank before I noticed the smell.
Should I do another water change or not worry about it?

 

[Kershaw]

Couldn't hurt to do another water change. Better safe then sorry. I don't know if that is the cause though.