[charlie b]

That looks about right, a little difficult to see but if it is in the tubing too then yes its about right. is there any opportunity for the liquid to evapourate, is it a sealed circuit.

I would leave a small breath hole on reservoir, for bacterial growth is either aerobic (in air) or anaerobic (no air) this stuff is not design to be without air after mixing and could grow some other anaerobic nasties as opposed to the aerobic ones that its used to which may in turn have their own odd effects.

Better stick to what you know to expect from it than do your own bacterial research, lol.

remember that the liquid will get stronger over time and will need topping up from time to time. When you do top it up, don't just add water, you must mix a weak coolant solution and add that to it, or you can have separation occur. I know it sounds strange but i've seen it happen. Doesn't always and its pretty rare in my experience but i don't risk it since i saw it.