I learned about this place when i answered an add on craigslist for a halide light. The light was gone but lucky me i got this for free. Ok well about me. I started with a nano cube 10 gallon about 5 years ago, fish only. After a year i upgraded to a 30 g tank and added 3 happy clowns to my engineer damsel squad. I just upgraded to a 50 gallon tank and am venturing into reef. this is a whole new ball game. Now my tank that was around 30lbs of live rock is expanding to close to 70 I had to have a new light and i have no idea where my sand keeps going. well last week i added some polyps and mushrooms and an anemone. don't' know if i got the right one for my clown fish though and my emerald crab seems to torment it. I think the fun part is learning all the new stuff, it is a slow process and i can use all the help i can get. thanks all.