inwall? i like .... definitly make sure u get pre cured live rock when u get more and evn than itd be a good idea to put it in a seperate container for a little while to be sure... i didnt see any powerheads in ther, youll prolly want 2 one on each side facing each other ...that skimmer doesnt look so hot, you'll prolly wanna upgrade that sooner or later but as long as u keep up on your water chanes you should be ok....