Even that seemingly straightforward question is not as
easy as it seems. The equipment can be virtually identical
(filter, heater, light) if you're comparing simple fish-only
set ups. On the other hand, if you have a freshwater planted
aquarium, there's a whole bunch of CO2-related equipment
to be added. If you want to do marine reefkeeping, the
equipment needed include the basics plus protein skimmer,
elaborate lighting, sumps, refugiums, etc., etc. hth.

-coelacanth

wrote in message
...
CAn anyone tell me what the difference is between salt and fresh water. I
am
curious to know the difference's in equipment only, I understand the care
and maintance will be different, but what are the equipment differences ?

Thanks.