Good eveving! I have a quick question that I hope somebody can help answer. I have a 10 gallon, heavily planted, red cherry shrimp only tank. I have had the shrimp for 8 months with no problems. Tonight, before turning in for the night, I checked the tank. Usually the shrimp are all over the place but tonight they are all bunched together in two different spots. One pile is on the intake sponge and the others are massed into the java moss. This is weird! They are just hanging out! I have never witnessed this behavior and I am sorta worried. Any clues?