i have recently set up a rio 180 aquarium as fish only at the moment i have to original filter that comes with this tank plus an external aqua one cf 1000 filter running. no rock yet. i want to add live rock, but can i keep the filters running when i have added it. also what type of protein skimmer do people recomened for a 180l tank? it will need to be internal as i have no sump.