Any bro or sis using this skimmer? Just bought this skimmer and after fixing it up notice some thing. The pump and the skimmer body after connected it does not level. There was a gap under the pump where I need to put some sponge under it. Is it suppose to be like this? If the design like this for us to put the sponge then why need the white bracket for the pump and the black rubber under the bracket.