Yes, just one after another. I am not aware of them in there and they seem to do their job. If I am having a boost I use that the next morning.
I find this works for me. I insert 2 x 10 every third night, which I know isn't ideal re remembering a routine, but I find I can't go beyond a 3 day gap now the dose is reduced. I have got used to it now using a calendar.
If it were me, I think I would use the 25s whilst you have them as the lower dosage isn't the same! IMHO pf course.