Hey welcome Fire bellied toads are commonly kept in paludariums and make great displays but they may eat or poison fish with the toxins they produce. Depending on the height of the enclosure a very high UVB might be needed to reach their needs, Exo terra have a UVB rating system which will help you with this. The popular oriental fire bellied toads do best in the mid 70s fehreinheight. Great species for a display. They'll float in the water with their legs exposed and you'll see their nice red belly. For information on their care they're are several articles on care in the practical pet keeping magazine which are useful and upto date