Hello! I am new here, and I am seeking some advice. I have recently got some new fish, and they are acting a bit strange. One of the fish is staying in its location, only moving a little bit to try to scare any other fish in it. Its location is near the heater. The fish is also pregnant. Wondering what the problem is with this fish. Is it sick? It is also not eating any food. Another problem I have is the fish are staying to close to the heater. I have 4 fish (one is the pregnant one, which is not moving like the others) the other 3 fish are moving around find but sometimes tend to go to the heater. Here is another question, I have 1 yellow fish, 1 orange fish, 1 red fish (red is pregnant one) and 1 grey fish. The yellow fish chases the red and the grey fish, but not the orange. The red chases the grey one. These fish are all the same breed. Im wondering why they chase each other in this sequence. Keep in mind, they are all the same size. Hopefully somebody can help me out! Thank you!