i did but they were in my attic which burned down. we also had a regular green tree frog but he died. cant remember why. the only problem we ever had was the tree frog eating gravel which i had to take out with tweezers a few years back. too small for newts????? they arent big. the two toads have never been a problem,
nor the newts which ive only had for about 4years the other 2 that were in there beat up my salamander i dont know why. when the salamander died 5 years ago we got more newts. which we've had no problems with since. and ik about the toxins. I knew about them when we started the tank. I've never heard anything about the toxins killing other tankmates. ik they had a nasty taste to predators and could be fatal when eaten. But ive never heard that housing them could kill eachother. I'll see if we still have some pics but i dont think so. In the meantime i'll see if i can get a hold of a camera and take a few pics of the tank now. and the chubby frog is otherwise known as the asian painted frog:
http://cutechubbycrew.files.wordpress.com/2009/04/chubby-frog.jpg
not aggressive at all.