Well.... for starters, at the time it happened, I had 7 clown fish. I bought 2 PNG clowns that appearantly had something called "clown fish disease". It only wiped out the clowns and nothing else.
As far as the females "guarding" the anemone. I am probably using the wrong word. I mean that they "stay" in the anemones more so than the males. I've actually never seen any variety of my clown fish get aggressive. EXCEPT A MAROON THAT WAS VERY AGGRESSIVE, and was removed from the tank within 24 hours (would have been faster, but he was a quick little bastard). I haven't witnessed the "territorial nature" that seems to be the "accepted" reality.
I think I take great care of my tanks and my fish. I've definitely made my share of mistakes, but I don't consider my clown fish dominated tank to be one of them. It's by far the most enjoyable tank that I've ever had, and I'd do it again and again and again. I would also recommend it to anyone who has the want or desire to do it. Why? Because it doesnt take a rocket scientist to IMMEDIATELY recognize a problem. If you drop a clown fish in your tank and something appears to be wrong, then you can take it back out.
By the way, the words....."I think" typically start an opinion....not advice. That being said, I still think the more clowns the merry-er-er.
Here's my advice...... You should do whatever makes you happy. You should do whatever you can afford, and you should do whatever YOU can live with.
If you can live with all the potential outcomes then you can add sharks and sea lions to your tank. It might work out, it might not. That being said, I'm pretty sure that if you want to add 4 more clowns to YOUR (it is yours in the end remember) aquarium, then you shouldn't even post it. You should just go down to your LFS and buy them. Otherwise people that are pretty sure they know way more than you are going to post a bunch of "opinions" that they've read about, heard about, but rarely have seen in person. Unless the response starts with the words....."WHEN I DID IT" then I would skip to the next post.
There are about a million people out there (probably more) who will tell you that you shouldn't have anemones in a tank less than a year old because it takes at least that long for the water to.......I don't even know what happens to the water or the tank. Here's what I do know.... I've kept 2 ritteri, and 19 BTA anemones in my tank since about week 2, and they have been thriving for 9 months. Some people with 20 years experience can't keep a ritteri alive for 2 weeks. Am I magic? I am the mistic ritteri keeper? Obviously no, but I did research and figured 400w metal halides (in pendants) and huge flow was a good starting point, and more important, I thought the potential enjoyment was greater than the risk.
Some people buy beautiful RBTA's and cut them up with scissors. Imagine the horror.
Do whatever makes you happy, and I wish you the best of luck! I will post pics shortly.