Woke up this morning and my Blenny was lying on the tank floor and not in his usual hole. he was kinda shaking. And when he moved away he Slithered like a snake along the bottom of the tank. He has always been healthy and does not seem to have any physical damage on him. This is really worrying me as he is my favourite fishy. Parameters are fine and the other tank mates are happy as can be. Does anyone know what is going on?