seems to be a personal preference...older seaclones had some design flaws that could be fixed by owners...the newer ones took care of it...the prizms are said to make too much noise sometimes, but taken care of by ordering the better impeller...sea clones tend to be cheaper & rated for maybe 10 gallons or so if you want to go by mfg. #'s...
Hi,
They hang on the outside. You should check into a CPR bakpak, you can put your heater inthe bio chamber to get it out of the tank. Also, aquaC remora is a great skimmer. just my .02
-Josh-
i really think the prizm is probably better. when i worked at the lfs that is the skimmer that i referred every customer to because its price was not to high and it serves it purpose well.
my lfs a just reef store in nashua nh advised a remora pro and they said the prizm is ok but the recommended the remora pro. (price is more expensive but they dont always recommend the more expensive stuff)