Symon-
He's exactly right. You'll definitely need a chiller. You've seen my lighting setup in person (510w) over my 50g, and I evaporate like crazy....about 2 gallons per day in the summer. Now that it's winter time, I am down to about 3/4 gallons per day.
I'm going to have to get a chiller for my setup when May/June rolls around. I know you plan on getting a bigger tank and all, but be forewarned.
RevRoy-
As I stated above, I have a 50g reef with a 400w halide and 2x55w actinics. Most people recommend using two halides over a 4' tank, but 1 MH gives me a place to put lower light corals (shrooms and leathers), while I can put my more light demanding corals towards more direct light. Everything has been working just fine.
To answer your question, you can keep zoos and shrooms under either of the lighting setups that you have. However it wasnt until I added a MH fixture that the colors of the shrooms/zoos got more vibrant, and the corals began to grow at a MUCH faster rate. Within 3 months of the MH being installed there are some zoos that are spreading so fast that I wish I hadn't even added them. The rate of growth has multiplied three fold.
So, yes you can keep zoos/shrooms under either lighting. Is it the best lighting for these corals? Probably not.
