i have a proquatics 1600 givin to me thru a second party and it wont startup.it kind of wants to and make the water move a little at initial start but thats it.it has water in it.i have 10" of water in a 55g(setting up a amozon river terrerium/aquarium.the intake is about 2" below the waterline and the outtake is about 10" above waterline,could this be the problem.plus i cant even get the darn cap open!grrrr