What book did you read? Did you read the entire book? Was the book about saltwater or keeping fish in general? I'm really blown away that you've read a book and still don't know some of these answers.
Are you testing your water? What do you test for? AM,NI,NA,CAL,PH,ALK,SG?
As for two anemones within one tank - that is the first no no. Unless in a 55 gal+ tank anemones shouldn't be placed in the same tank. They could possibly kill eachother by secreating chemicals harmful to other anemones.
A 12 gallon tank is WAY too small to keep an anemone. unless that is the only thing you will keep in the tank, i suggest upgrading to a new tank (much less keeping 2 anemones).
About having your tank setup for a year - this isn't necessarily true, it is a just a general rule. Because after 12 months your tank is usually pretty stable and the hobbiest comes accustome to water changes, testing water, etc. Anemone's need a very stable environment to survive - this usually comes as the tank ages.
What to feed an anemone - you shouldn't be feeding it mixed up food, anemones should be eating chunks of raw fish/shrimp. Most people feed their anemones silversides or chunks of raw shrimp. Any piece you feed the anemone should be no bigger than its mouth. To feed it, just place the food on/near the tenticles and let it grab onto the food itself. If after a week of feeding the anemone still isn't grabbing onto the food and eating it, try another type of food. After a few weeks of doing this and the anemone isn't liking anything, IMO that points to an unhealthy creater.
13 watts of Compact Flor. is not nearly enough for an anemone. The GENERAL rule of thumb is 5 watts per gallon of T5 or MH lighting. When is comes to PC (power compact) IMO there isn't enough lighting you could possibly put on a 15 gallon aquarium to keep the anemone alive.
Your supplyer sucks. There i said it. He absolutely sucks. Anyone who is willing to sell you two anemones, and sell you and the bs notion that they eat brine shrimp and can live on PC lighting is either trying make an easy sell, or they are totally clueless about saltwater. In either case DISCONTINUE taking advise from this person and find a new 'supplier'.
If you take a few days and read all of the archives and articles on this board you will learn 99.9% of what is needed to start out in this hobby. The rest of your questions just ask and plenty of people will help. IMO you need to throw away what book you've purchased and pickup another one. There are some good books on this site, and i'm sure someone else can point you in the direction of some good reads.
Good luck!
