microscopic

Hi all, longtime lurker for tips on the forum, decided to finally ask for some help. I was wondering if anyone could help me with identifying some of the algae I've got going on in my aquarium. I'm pretty sure I'm facing 3 distinct types, I included some (very) up close photos of the algae as...

Can someone please give me some pictures of what normal and healthy fish look like under the microscope? I have tried to identify infections with my microscope, but I have a hard time knowing what is a pathogen and what is a normal part of the body (especially in the digestive system). At the...