They are smart. They actually looking for gap to jump through, trying to get out of tank. I have lost flasher and fairy when I am in a hurry to feed and momentarily crack the lid open.
I lost a Eightline flasher and Naoko fairy this way. Needless to say I am always observant when I crack the lip open now. My overflow also covered. Jump proof now.
I lost a Eightline flasher and Naoko fairy this way. Needless to say I am always observant when I crack the lip open now. My overflow also covered. Jump proof now.