Well, as it happens, Lionfish are pretty easy to keep as saltwater fish go, and good for beginners in that regard. They're terrible for beginners in pretty much every other way, though.
Don't feed it goldfish. Goldfish have an enzyme in them which blocks vitamin B, and this is very bad for a fish that eats them too much. Feed it something better like, say, frozen silversides, which you can buy as fishfood.
Lionfish live a long time and get very large. You think your tank is big now, but with an adult Lion in it you'll know how small it really is, oh yeah.
Tanks like the one you're planning require a lot of upkeep. A bunch of big fish make a big mess, you see. This is fine as long as you're prepared to make the water changes you'll need to in order to keep your tank able to support fish life.
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