Struggling Well

We have two wells on the farm. They are tied together with a valve in between them. This valve is closed unless a well pump goes bad and we need water. The well that feeds the barn has been really struggling the last year or so and is slowly getting worse. It has been fine in the morning but in the evening it has been a real joke. No water to wash down the parlor. Takes the vat 45 min. to fill up to wash the system. Things of this nature. (The vat should fill in less than 5 min.) Also, the well that feeds the house is not a very good well either. If I open the valve so the house well will feed the barn also then the house doesn't have water when you are washing the parlor down. This is very annoying. Especially if your stuck in the shower.... Anyway, yesterday we took a 300 gallon tank I had placed strategically in the back room several years ago and put it to good use, finally. This tank catches all the wash water from the milking system except the initial rinse cycle. I also plumbed the wash machine discharge into the tank. Currently, there is no water going into the tank from the well. Last night it was full again after all the cycles had run. Hopefully this will take a lot of stress off of the well. Also, I am going to try to open the house well to the barn and see what happens. Hopefully, we won't lose water at the house because we are not pulling water out of the well to wash down....