I want to swap my internal filter and heater for a DIY all in hood set up. I want to put stick insects above the tank to. My tank is under the roof line but I think my design will work, aesthetically. Do you think I'll be able to put the heater and filter material in the pyramid above the tank section? Would the water have to be under pressure going into the hood? Will it be OK just to use an underwater pump, behind a weir to send water up?