Over the past few days or weeks, one of my white cloud minnows has been acting very lethargic and won’t eat much and is just not swimming either, just getting carried by the current of the filter. I used to have a small hospital tank but now I’ve drained it so I’m unsure what to do. Also I have a huge animal problem in this tank, there are Malaysian trumpet snails I think and another type. What can I do to try and combat this too?