Thanks for that again John. The frogs hide ALL the time! The only time I see them out is when I disturb them by moving stuff in the tank etc. I have an underground tunnel made from a PVC pipe and they spend most their time in there. I have some pieces of wood and a bit of moss in there and they'll hide under this too. One of them is more outgoing and is the first to poke his (her) nose out if anything's going on, the other one I hardly see and have to check every couple of days it's still alive!