Like a pond with only a pump with the tube going back to the same pond and the tube will be submerged inside the pond. I don't find waterfalls to be very attractive like many people do. I like a still pond that resembles a wildlife pond or a marsh. The only reason I want the pump to be in there is so less mosquitoes. Is this possible? I'm going to line it 20x10ft probably. I ask this because I have never heard of seen any pond without a waterfall thats not a pumpless wildlife pond. Are there any negative outcomes to not having a waterfall?