Damn! save some for the rest of us, lol. Here are a few:
LS --Live Sand
LR-- Live Rock
BW -- Bio Wheel
BF-- Biological Filtration
MH--Metal Halide
PC--Power Compact
RO--Reverse Osmosis
HOF--Hang on filter
CF- Canister filter
OF--Over flow
blaa blaa blaa
OK I am lazy, that's all you get for now, LOL.
--EMI