Earlier in one of your threads. You were showing pictures of how to set up a 30 gallon reef tank with the two powerheads. I liked what i saw in the pictures. But let me get this stright the power heads are sucking water from the top of the tank then flowing to the bottom of the tank right? Or would that be the other way around where the water is going from top to bottom. I am going to build that setup this week. I am still learning new things every day. In my eclipse 30 gallon it has that built in biowheel and somesort of filtration system. Would i even need it anymore with this new setup? If that is the case i am going to redo the whole lighting and build a new canopy and do away the lid and all.. Thanks for all the help/