i want to move marine saltwater fish

[shuwang]

I got a fish tank with Malawi fish (Tropical Freshwater) in it, but I want to upgrade to marine saltwater fish?
I have a 350 liter Tank, a big Filter, a heater and some rocks right now with my Tropical fish, but after I have got rid of them, what else will I need to add Marine fish in?

[Marcus Russo]

Typically with corals you will need to add a skimmer for protein removal in a saltwater tank.
Lighting also is dependent on the types of corals and such you plan to keep.

You did not specify type of filter you have in your fish tank so you may want to look @ some type of canister filter for removal of gook!!