Fire belly toads don't move just hide

[justpeachy]

Hi, I need some help. I have one fire belly toad for about a year in a small tank with a little water and a big rock to climb on. He was a pretty green and a very big eater. Over the last few months he quite eating his crickets so I got him meal worms which he would take from my hand but is now an ugly brown/gray color. A month ago he quite eating every now and then about once a week he eats one cricket for me. I got him(her) a friend this weekend and changed up the setup all together. I moved him to a 30 gallon tank with a water fall a large rock bottom a bridge to sit on and a tree branch also to climb on. Since I moved the orginial one in he has not moved from under some moss at the top of the water fall and the new one was very active when I first put it in now it sits with the other one in the top corner of the rock water fall. Why are they not active and in the water. I got them this big tank and you don't even know I have FTB in there. The temp is around 73 at night and up to 80 during the day. I have never heard my orginial making any noise and have had the new one for three days now and it also doesn't make noise so it seems.