lol, you must not have resurched your fish. Pristella tetras are some of the nicest ones around.
Your ID shark hides because it is nocturnal. But in a while that "shar" which is really a giant cat fish, will out grow your tank and have the nice little pristella tetras as a midnight snack.
so unless you a couple hundered gallon tank, id advise you to get rid ofd the id sharks.
