The tank looks nice. The plastic is probably OK, but if the toy has a squeeker inside, it could rust and that's not good. I have 2 other precautionary items. One, do you have a secure lid on the tank (when not taking photographs)? Be sure the gaps around the cords are well sealed. Two, feed the newt by hand, or in the area without gravel. It is possible that a newt can eat a piece of stone and die this way. There are some "wrong sized" pebbles in there. This is unlikely to cause a problem, but you never know.
The water level looks good, but it could be higher, up to 25+ cm is OK, as long as there are still islands. My hongkongensis loves to sit in a cave that is half-full of water (the cave sits on a submerged rock near the surface).
(Message edited by jennewt on January 05, 2007)