Sump Pump

[Snufflupagus]

Hey all,

I have a 96 gallon reef tank going right now and I'm running it with a fluval filter and would like to change to using a sump pump. Now I don't know much about going about this, so I was wondering if anyone could give some good advise. How big does the sump pump have to be? With the tank having water and corals and fish in it already I'm guessing it's not possible to drill the tank so I'm thinking I'd have to go in over the top of the tank with lines, like I do with my filter now, is that correct? I'm just looking into doing this at this time so any advise would help.

Thanks,

Colin