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Try with spots with PAR around 100 first, then slightly increase. https://portlandaquarium.net/reef-tank-led-light/

Because Corals live deeply under sea where only high energy blue light can reach and they can only use blue light. https://portlandaquarium.net/reef-tank-led-light/

A 18 inch Current USA Orbit Marine is suitable for your need, you can read the guide for reef lighting in this article: https://portlandaquarium.net/reef-tank-led-light/

You have to remember filtration is predicated on bio load, so you really can’t over filter a tank. An external filter canister good for 100g will only filter what your 30g feeds it

i would run a fish tank filter with floss.all the light stuff will settle on top of the sand and when you fire up the powerheads it will cloud up again.

and a sump does not contain biological media like a wet and dry filtration does with bio balls. Most wet/dry's use a pad, whereas in a sump you would use filter bags to catch debris.

I think your better bet is installing fans...it is always good to have a heater for aquarium fish in case of those cold nights.

You can get two 250w Aqueon Pro heaters for about $40. That's more than twice the price, but it's still only $23.10 more.

Very nice 5 gallon tank. Here are my tanks: https://lovefishtank.com/5-gallon-fish-tank-kit/