I bought my first 2 ADFs yesterday and put them in my 5 gallon aquarium. Everyone was happy and lively when I went to bed. Woke up this morning and I can't find the frogs! The aquarium is a covered one except for a small half circle at the front. I jostled some leaves and my driftwood - no frogs. Looked all around, inside and outside the aquarium - no frogs. Do they hide under substrate? I have some small gravel at the bottom of the aquarium. I don't know what to do next.