Since my 2.5 gallon minibow has a gravel bottom, about 2 inches high, since it has an under gravel filter, how should I feed my frog? The pellets sink to the bottom, on the gravel. My frog can't find it. What should I do? And no, I'de rather not feed live or frozen food. I've done that and it's disguisting, messy, and takes time. What should I do?