Hello everyone. I just wanted to ask you guys something. I have had my goldfish for a good 6-7 months now and recently this fantail goldfish (the pure gold one) keeps on sitting at the bottom of the tank only at night. I just wanted to know if it is normal (due to it sleeping) or due to a disease? The other 7-8 goldfish in the tank are perfectly healthy (touch wood). I also have an issue with my red cap oranda goldfish, it keeps on sitting at the bottom of the filter since I transferred all of them today. This is really weird. Help please thank you.