Sorry missed your reply and about the froglet's death . Looked at your response and still concerned with the water. You need to change it daily; even if it looks clean. Frogs pee on their water and froglets are not smart to get out. Over time the toxins accumulate in their body and cause Toxic Out Syndrome with similar neurological symptoms to what you describe. Also; what dechlorinator are you using and check it's not expired. Good luck with other one !