well its going to depend on how much area you have to work with under your tank?
as for a submersible like a mag 18-24 your going to add 2-3 deg in water temp.
And if you go with a external you are going to have to hve the room to put it in and along you will have to get your sump drilled
bottom line is it's preference and submersible you dont drill
and external you have to plumb it.
mike
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180 starfire front, LPS, millipora
Doesn't matter how much you have been reading until you take the plunge.
You don't know as much as you think.
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