I have had my panda and red moor for over 6 months now. There was a black moor as well, but he died about 7-8 weeks ago. For the past 3 weeks, all they've been doing is staying at the bottom of the tank, occasionally moving to another spot and back again. They swim up and eat their food when I feed them, but all the rest of the time, they stay at the bottom of the tank. Is there something wrong? or is it because they miss their friend?