AquaClear? MMMM. Has anyone used them on a large tank?? My Emporers make a lot of surface current which is killing my CO2. I have a 60 gallon tank, would 2 of the biggest AQ's be too much?? I think they are the AQ500's?? With SA Cichlids I need GOOD filtration, but want to slow the current down a little. The AQ filters are CHEAP, so I am willing to give them a shot, but my AQ20 on my little hex tank is fussy and clogs up fast. Are the big ones more durable?