Zoanthids and other polyps are probably the easiest things to care for in my opinion.
You can use your Aquaclear to add more flow. Don't put anything in it (or just run carbon if you'd like). You don't need the sponge, but if you do use the sponge, make sure you clean it regularly (i.e. weekly) so crud doesn't build up in it.
A 24"x12"x18" is a little over 20G I believe...
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