I have a 30 gallon tank with 3 rams,two rainbows, and three convicts...one male convict(about 3 inches) and two females convicts(2 inches)...I just noticed that the two female convicts are hanging out in weird places, one under the filter, one next to the heater. All of my other fish are fine and all my water levels are good. What could be bothering them and what do you suggest?