its hard to tell.about 5 months ago i had a sea apple and i moved it and 5 were dead by morning.two clowns and a yellow goby lived for four months.i had a coral beaty with white spots that looked like ich and i took him out three days later after noticeing it.i bought two cardinals and they never ate and died a week later.flamin angle died,shrimp,and my clowns were loseing color and were weak so after all that my dart fish lasted for almost a month.i figured cause he always stayed in the middle.i bought a lion after everything died and after two weeks he lost his color and was going to the top gasping for air