here are my 3 fat lesser sirens. i got them last year from Jacks' aquarium. they were really skinny and looked like worms.
P.S. i cant take any decent pictures. so this is the best i can do
these are lesser sirens. they should not get bigger than a rope fish. probably 12-14 inches. they have small mouths so they dont bother cory cats and other fish. they seem to love carnivour pellets.
I have seen greater siren once. it was about 2 feet long and as thick as my arm. definitely a cool animal. i really wanted to buy it, but i did not have any space
No, they are fully aquatic amphibians. They only have small arms, but no legs. The temp stays at 83F. they dont seem to like each other. they fight often, but i have not seen any damage.