So i have a green tree frog, fred. i bought another one who is like super jumpy and stressed.(oscar) when i put oscar in the tank with fred, fred started being really stressed as well. why is that? like every time i go into the room he freaks out and hides behind a plant. i used to be able to open the tank and put crickets in when ever and he wouldnt really care, but now he freaks out. why??