I don't want to judge without actually seeing the small gravel you are talking about, but your frogs could become impacted and die if they ingest the wrong size piece. I'm a little surprised that you went to all the effort of ordering frogs and having them shipped (which could not have been cheap) but you don't think it's worth the trouble to remove a dangerous substrate from their tank.
At least they look healthy so you're off to a good start. They are probably pale from the stress of shipping, they will darken soon. HOB filter is fine, as they get bigger you'll want a filter that capable of cleaning a tank 2x the size of the one you have (in case you don't already have one). There is no need for a bubble wand, it may or may not scare the frogs.





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