[Vez]

76 is fine for a temp, the dark hours 71 in the dark hours is also alright for most strains. Try making a small Co2 Emission system, it will raise your temps to the optimal range and the nights should be a bit better.

The cheapest:effective way to fuel CO2 in my opinion (if you dont have too much money to get a nice CO2 system) is to get a block of dry ice and cut a couple holes in the top of the styrofoam storage unit. Buy a cheap 3 dollar air filter at a thrift store, take the filter out and put the intake side face down over the holes so it sucks the CO2 up and blows it onto your plants and at the same time it blows away the old oxygen that is sitting around/on the leaves.