My friend was recently given an ADF in a bowl. He got the frog into a 5 gallon tank, but without a filter. I got him a heater and sponge filter, as well as a bottle of Tetra Safestart, which we installed in the tank last week. Today he was found lying on his back in the tank. He isn’t lying on his back anymore, but he still isn’t moving a lot. He’s also about 2-3 years old. Is the frog sick?