If you are going to try the picture method, give it more than one night. Try taping a picture to the tank for a week or two to see if that helps. Also i don't think the age of the clown matters, its more of a where the clown came from type of thing. Wild caught clowns have a much higher probability of hosting an anemone then aquacultured ones. Although you can still have success with tank raised hosting anemones, i think it becomes more of a learned trait. If they see a wild caught clown hosting, or they are direct decendents of wild caught clowns they have a good chance of hosting, the further down the hereditary line you travel, the less likely IMO you have of them hosting.
Don't get defensive because people on this board are telling you things you don't want to hear. We are just trying to help you out. And you just jumping at someone because you've done a couple HOURS of research, arguing because your LFS or brother told you something is ludacris. If you don't agree with someone site some examples, throw out some text book citations, but don't sit there and say i've done a few hours of research and your wrong... And I'm not sure if the 13 watts per gallon is true, but if it is you wither have a lot of crap lighting, or you have too much lighting in a small tank. And at that amount, I do not think feeding would be necessary.
The reason people were saying you were wrong was because you wanted to argue the fact that hosting creates a healthier relationship for the anemone and clown. When I don't think that is true at all. I have one clown hosting a BTA a nd another just chilling in the corner, and both swim the same amount, eat the same amount, chase other fish around the same amount, everything is equal. So to say that they are healthier is crazy. As for the anemone I can give you 5 posts in the past two weeks of people who's clowns have actually killed their anemones because of agressive hosting. So I would agrue that hosting can be a detriment to their survival (depending on the species of clown and anemone).
Do what you want, I do wish you the best of luck. My only advice would be not to get so defensive, just listen, if you don't agree that is fine, but don't agree on the basis of fact and science, not on the fact that its not what you want to here. If you continue down that path people will become less likely to try to help you out.
Good luck.