yea carbon filters for smell. you need a cool air inlet hole towards the bottom of the tent and an exhaust fan at the top to pull stale hot air out. also a small fan mounted inside for circulation later on. i usually just put my seeds in a shot glass in 7.0 neutral ph'd or drinking r/o water with a cup over it till the next day then plant my seeds in regular plastic disposable drinking cups with plenty of drain holes poked in bottom. i make a hole about 1/4" deep with pencil eraser drop seeds in and water till it drains from bottom and spray down the inside of a clear dome or big gallon clear ice cream tub and place them inside under a small flourcent shop light till they have all sprouted and with in a week or so i transfer to my final medium or bubbler if they are ready.