Hello and welcome to FF ! Your frog could be stressed, covering sides and back of enclosure with aquarium background or any dark paper could help. Where did you sourced your frog from? It's better to quarantine them for a month before introducing them to a decorated enclosure.

See some red areas in the left feet; both front and back. You might want to keep a watch on those, specially if they spread to other feet.

Can use a glass small glass bowl semi-buried in substrate as a feeder. Half a dozen gut loaded crickets (carrots, lettuce, and cherios cereal) sized as Amy stated should work OK. You need to use supplements, more info on that in here: http://www.frogforum.net/food-feeder...schedules.html. Good luck!