im about to plant my 125. right now i have a shallow layer of black sand, an xp3, and 2 emp 400s. i wonder if these emp 400s will be a problem with pressurized co2? i want to run a medium light tank with pressurized co2. im planning on ordering a 4' 260 watt PC fixture ( http://www.drsfostersmith.com/product/prod_display.cfm?c=3578+3733+13733&pcatid=13733 ) to go with the 120 watt fixture i already have, giving me 380 watts or 3.04wpg. as well as this co2 kit ( http://www.drsfostersmith.com/product/prod_display.cfm?c=3578+3747+9935&pcatid=9935 ) are these lights and co2 kit overpriced and are there other options i should look at? I already have two co2 tanks that i used with a kegerator. will these work or are they a different type of co2? also what should i do for substrate? I was thinking i would mix in about 5 bags of flourite black sand with the black sand i currently have, but i heard that this substrate was very dirty. so i guess i will use the regular black flourite? what is a good website with fast shipping to order plants from? i would like mainly amazonian plants. maybe there is a website that offers plant packs or something as i dont know much about specific plants yet. thanks, richard.