Sure, with the right conditions you can grow out your Anemones. Many aquarists have had saltwater tanks in a variety of sizes, with a variety of anemone/fish species. Your tank would be perfectly suitable.

I'm hoping someone, like our buddy Cliff chimes in. He'd be my go-to for saltwater tanks. =]

I only know about as much as I've read, so I think you're about to get into questions that exceed my ability to answer. lol I've yet to venture forth into marine/reef tanks.