ya, your light will be fine for it. You might be fine, but just keep an eye on it. I personally wouldnt put a nem in any tank under a year old, just because you havent seen any spikes doesnt mean you are in the free and clear. At the very least, i would have waited 6 months.
Just make sure the nem isnt wandering around and isnt bleaching.
Also you need to slow down, you are heading towards disaster with how fast you are moving. Nothing good happens fast in our tank.
Finally, anthelias are not a good choice for your tank. They require larger tanks, need to kept in schools and they have to be feed a ton. They have a super high metabolism so they can be quite a challenge to feed, so even if they would fit well in your tank, trying to keep them feed would wreck havoc on your water levels.
Something to keep in mind, your fish should be living at least 5 years. There are always random deaths, but most of your fish should be living that long. If you are chronically losing fish, you have an issue.