I want help on the matter because it is urgent. My oldest guppy is acting strange, have had her for a while and she has never acted like this before. My tank is a 2.5 gallon and my filter is an API 10 superclean. I am attaching a photo, she keeps going up to the filter like this, when I move the filter she swims away but will not leave the top of the tank, this is her third time doing this, the first time i thought her fin got stuck. This molly who is in the tank with her proves to be a bully to the other fish along with her, will not stop nipping at her fins and body and terrorizing her. I am in a bit of a panic, and I am extremely disheveled. If you know what could be wrong please tell me.
Update: she is now leant against a decoration ,she is swimming oddly around the tank, her body is leaning as if she is soon to die , but holding onto life
please help as soon as possible