I have two fire belly toads in a standard 10 gallon tank. One is bright green and eating anything i put in, either on the tongs or out of the water does not matter.

However, the other one some days is so dark it is almost black in color and will catch and kill the cricket but then spit it back out. He/she does not make any sounds but "huggs" the brighter one to the point the brighter one will pull itself out of the dark ones grip. The darker one also sleeps alot, should I be worried or is this normal?

Temps are between 75 and 80
Water is clear and has a filter

Thank you for all your help