Hello to all, very new to saltwater tanks and just purchased a 125G tank that I am going to make a saltwater set up. I don't have any other equipment as for now except a Fluval FX5 filter. I was advised by a LPS that the FX5 was plenty for my tank but I have noticed that most people on this sight are using a sump system. Is the FX5 a pink elephant or will it work OK. If anyone has any thoughts that would be great. Also need other items such as protien skimmer, rock, light etc. Thanks.