I really want to setup a reef tank in the future, but I'd like to read and get as much information as possible. ATM, I have a bare 55 gallon tank that I would like to possibly turn into a reef tank. I would most likely do a custom Calfo Overflow such as my dad did to his 105g ( http://www.lareefclub.com/forum/viewtopic.php?t=2056 ). For the past week or so I've been looking online at Metal Halides and Skimmers. The MHs that I've really looked into are the SunPod HQI Metal Halides with Lunar Lights ( http://www.drsfostersmith.com/Product/P ... 004+113352 ). My question concering this is do you guys think that 300watts is overkill for an 18" tall tank? I would like to keep a type of Tridacna Clam, and from what I've read, MHs are a must. As far as a sump/refugium, I've looked into the Protein Skimmer and Refugium Combo ( http://www.drsfostersmith.com/Product/P ... 2004&Nty=1 ). Do any of you guys have experience with this type of combo. It seems like the standard external filter of skimmer > fuge > return. I would like to have your thoughts and input on this, as the skimmer doesn't have a name.