Why do you have two WellXTrol pressure tanks? Because some guys like to 'store' more water if the well is allow producing well or to prevent the well pump from starting frequently.
Both of them should have the same air pressure precharge, which should be 1-2 psi less than the turn the pump on switch setting; I.E. 30on/50off gets 29-28 psi air pressure with no water in the tanks.
There is a Sticky post at the top of this forum and IIRC tells you hpw to change the pressure switch settings but see below.
If you mean the other two tanks, you have a filter, probably an acid neutralizing filter for low pH acidic water and a softener because of hard water, iron, manganese and the hardness the AN filter adds as it buffers the acidity. You have Fleck 5600 control valves; softener is metered and the filter is a time clock model. Which one of those does the water line from the pressure tanks go to first? It should be the AN filter; that has the plug hole in the curved part of the top of the tank.
Unless you took those pictures at 1 AM and then 2 AM, the time of day is wrong on the control valves and, the softener was in a regeneration. That incorrect time will allow backwashing and regeneration at other times than 1 and 2 AM when they should do it. That will cause low flow while they are using water and the water quality will be reduced because you'll get raw water then until they are done. The filter you lie to and set it one hour ahead so the correct time of day on the softener, so it is done backwashing before the softener want to use water at 2 AM.
To find the gpm of the pump you need to look up the model number on the manufacturer's web site or the pump's manual. Or someone here that can read the gpm in the model number can tell you.
Well operation... A well is a hole in the ground meant and designed to collect and store water for future use. Now our self proclaimed well expert here, and maybe a couple of followers, might say highly engineered and properly designed, but it is a hole in the ground and there is next to nothing about it that is sanitary. You have a submersible pump in the well. When it comes on, water is moved from the well into the house and some or all of the recovery rate gpm of the well enters the well and fills it to the water table level in your yard. That is called the static water level. Usually that level will fall as you use water IF the recovery rate is less than the gpm you are taking out of the well.
IF you pump the well down to the inlet of the pump, the water stops and that is called a dry well. That is bad for a pump and she who you love'n admire and must obey, but it gives you a weekend project if you're lucky and it happens on a Friday night or Sat. morning. Otherwise you may get to take a day or two off work or just write a big check to a well driller or pump guy to fix it for you; unless you find a plumber that is capable and willing to do it for you (most aren't). Now some guys, actually most guys, that are handier than handsome types come here to find out how to DIY and if that's you, beware that some here don't want you to do that and will tell you to call the professionals in your area. psst... ask them if they can vouch for the local guys' knowledge, expertise, character and workmanship, along with if they know he doesn't beat his wife so he'll be around later if he screws it up. But remember this, if you want it done right, learn how to do it and become a DIY.