Good God what have you done? You have just started your long trip down the rabbit hole! LoL..
The tank looks great, I think Mr. Crabs is right when he says you need to open your rock work up some more, and turn your power heads to the surface. Have fun, and take it slow. Make sure the tank is cycled before you put fish in, and put your stocking list in slowly, over the course of about 2 to three weeks. Also keep in mind that an understocked tank is better than an overstocked tank! Good Luck!
Fish Sticks, the best thing you can do with your dead fish.