snail
No, AQUATIC turtles are great swimmers, I keep mine in a tank that 20 inches tall filled to the top and the turtles are only 1.5 & 2.25 inches in shell length. Red ear sliders, in the wild use deep water for protection from raccoons and other harmful animals.
Fish can disappear in a fish tank due to hiding in decorations or plants, being eaten by other fish, or jumping out of the tank.
yes because other animal can eat them.
About a 20 gallon tank.
Depending on the species, one or two. Turtles will keep growing through their entire lives, overcrowding or expecting them to only grow to the size of the tank is something that usually leads to dead turtles.
I think it depends on how big the turtles are.
No they will kill each other
Tapping on the glass of the tank !
No, a mussel or clam cannot be put in the same tank as a baby turtle. Baby turtles, as well as adult turtles will eat mussels and clams.
yes they poison the tank and kill other marine animals
The turtles will eat the fish.
In a tank? Snails, other fish, frogs.