I have a 12g tank with 8 Endlers in it...nothing else! 1 of the Endlers got moved into a hospital tank the other day due to fin rot so that left 7 Endlers in the tank. Well I only have 6 in the tank today . I have moved plants, checked round the back of things, I have even checked around the floor of the tank thinking maybe it'd jumped out while I had the tank lid open at some point...nothing!! Where on earth can a fish go...how do you loose a fish???