A few questions about T. marmoratus

[cso]

What's the full size/length of a T. marm and how long does it take to grow that big? Would it be a bad idea to have it share a tank with other Triturus species? Mine is about 4 inches long, would feeding it some trout worms be a bad idea? The worms seem kind of big.

 

[Chinadog]

The adult size would be 12-16cm with females being the bigger than males. T. marmoratus will hybridise with other Triturus newts, so shouldn't be housed with any other species.

There's no reason you can't feed Trout worms if your newts will eat them. They have a foul taste and smell though, so not all newts will. If you can get them, Canadian nightcrawlers don't have the horrid smell and are rarely turned down by most newts, especially greedy ones like T. marms, if they are too big for your newt at the moment you can chop them up into more manageable pieces.