Yeah thats what happened the first time I get fresh sand... I usually wait about a day and if it hasnt settled I still put my fish in... do you have a filter going or have you used one of those de-clouder things? Sometimes those help. And I have put in delicate fish in without the sand completely settled with no ill effects yet.. but thats just me
Ha ha thats cute love to see photo's when its done and its really easy if you have plants in the sand they will take care of it for you if you dont just poke with something the sand I'd say every few weeks so gas can escape.
Sometimes a little (very little) pinch of epsom salts will encourage the settling of dust in the water. We're talking less than a half teaspoon to ten gallons so the amount equal to your betta's morning meal is about right in a 1.
You'll be swapping this out later when you do a water change, so its not a long term worry.