1999 Mazda 626 over heating

Im not a mechanic but I do own a 2000 mazda 626 v6 for 3 years now and for 3 years Ive had overheating issues. First you said your water resiviour tank looks like its leaking some, does that water come out of a small black hose coming out of the tank in back on top? If so thats just the overflow escape exit and usually when a car gets to hot or over filled with coolant it will start coming out of that hose because of the pressure and thats normal as long as it doesnt have a crack in it that should be fine. Said your needle rises to the h zone and then to the middle, the normal position for that needle is about a fourth of the way up from the left or looks like its pointing to about 10:30. You may just have air in the radiator which is no problem just look how to elevate that issue. It can be a few things I THINK but im now mechanic, your thermostat may be bad which is not to much of a headache or check your fans in front of engine see if they turn on, you can check by putting the AC on but be careful not to touch the fans they are dangerous, have the radiator flushed cause it may be block with sediment or maybe a sensor but that I know nothing about or worst case your heads, they may be leaking and need new gaskets(like mine now.$1600)ouch or the worst worst is that they are cracked. Thats what I have learned from my piece of crap 2000 mazda 626 lx. Good luck hope something of the blabbing will help! But my best advice is go to a well know mechanic and have it checked. Try going to Auto Zone store or one of them and ask them to do their free warning light check and that may even help. But GO TO A MECHANIC before your HEADS get screwed up and you have to pay $1600 % O