H. crispa are hard to find in good shape to begin with. Often times they are bleached (or worse yet, dyed some neon yellow or pink). Like most anemones, once they get past the first few months and become established, H. crispa can be quite hardy, from what I've read. If you devoted your 36-gallon exclusively to a H. crispa and a pair of clowns, you should be okay. The lighting you are considering might be on the low side for anything but the most shallow of tanks. H. crispa tends to dig into the sand, so it would most likely be on the bottom of the tank. A fixture with T-5 HO and individual reflectors would be a better choice for a 16 inch deep tank, in my opinion.
You could realistically keep a pair of maroons in a 36 gallon with a nice big RBTA or GBTA. Maroons are the largest species of clown and therefore, you would want a good protein skimmer, along with good husbandry (i.e. regular water changes) to successfully keep the maroons and maintain good water quality. I would again say go with T-5's or MH instead of 2 65-watt PCs.
Before adding an anemone to a tank, you want the tank to fully cycle and all readings, including nitrates to be very low, preferably undetectable. A well established anemone can put up with less than perfect water quality, however, a new anemone is less hardy and less forgiving when it comes to water quality. You might be able to find a nice large RBTA clone (check your local reef club). Tank-raised clones are quite hardy and much better bet than a wild caught H. crispa from your lfs.
Do you have a protein skimmer? Sump? Refugium? All of these are helpful in maintaining good water quality, especially with large eaters like maroons. Chaetomorpha in the sump or refugium will absorb a good bit of nitrogenous waste, as will activated carbon. A protein skimmer will go a long way to eliminate waste by-products as well.