I'm a new homeowner and I've never dealt with tanks/pumps/water filteration before. This is a picture of my tank, but I noticed at the bottom of the tank, there is a very slow leak. Is this normal? What is this tank for? Is there some sort of maintenance I should be doing? I know nothing about this and I really need some help!

You will notice at the bottom of the tank there is a blue lid. That is where the water leakage is



There is also this thing which I have no clue what it is and the top of it has water in it (see 3rd picture below)






And there is this thing... I have no idea what this is




The happiest people don't have the best of everything. They just make the best of everything that they have. Live simply. Love generously. Care deeply. Speak kindly.