After suffering through a weeks worth of showers with dismal water pressure I have finally investigated some and need guidance. When no water is running the pressure gauge on the tank reads 45 ( I seem to remember it normally being at 60psi). Turn on a faucet, the pressure drops to 40 and the pump turns on. Pressure rises back to 60, the pump stops and the pressures starts dropping to 40 and the cycle begins again. FYI this is a hydro pneumatic tank and is approximately 6 yrs old. I read the helpful sticky on pressure tanks but I want to make sure I'm on the right track before I go and tinker with things. Any advice on what the problem might be or how to fix it is appreciated.