Hey all, this may be a silly question but I recently introduced a pair of ORA clownfish, they are about 2 inches. The tank is a 150 with lots of rocks. Only other stocking is hermits, yellow watchman and tiger pistol. I woke up this morning to find one of the clownfish swimming by himself after the two of them being insperable. Water parameters are all good. I've looked in the sump and overflow which is external and can't find it. I did notice they were hanging out by the overflow last night which is why I was worried but I don't think hes down there. Any help would be appreciated. Thanks!