OK, that is a little more to go with.
In keeping anemones, you will want to start off with either VHO or MH with halides being preferred. Mushrooms are lower light demanding so you would have to place them further down in the water column.
The thing with halides, is you have to keep them 8-10 inches off the water surface, so that makes your canopy larger. You also have to install vent fans to keep things cool as they get very hot. This is easily done and there are plenty of posts on those who have done that for ideas.
I would go with two 250w halides. IF you go with 15,000K or 20,000K, you wont need actinic lighting to go with it. However, if you want the dusk-to-dawn effect, go with 10,000 or 12,000K lighting with actinic PC lights.
Hope this helps.