Hello, I have a clown that's been acting funny the last couple days. Lately she has been placing herself against the overflow to stay in one spot. When I go to feed the tank though she swims right up grabs food until it's all gone then goes back to her spot. She will occasionally swim through the tank but for the most part stays in the one spot. It's not like she drifts there though, she goes there on purpose and sits. Could this be a sickness or nesting behavior maybe? I've got another clown that has been in there with her for over a year now. Nothing else has been added recently. I just went from 4 fish down to the 2 clowns. Water parameters are stable and temp has been stable for over a week at 76 since it has cooled down from the heat wave. I just did a water change with scripps today as well. This has been going on about 2 days now. Any ideas?