Help unidentified parasites

[neil9999]

Hi all

I scrapped a plant today to examine under the microscope as there seems to me some sort of algae on it and I was trying to figure out which type.
When I put it under the microscope I can see little parasites running around.
What are they.
I did have ich in the tank a couple of months ago which was cleared up with a few weeks treatment. The fish are not displaying any flashing or white spots and these seem to look different under the microscope.
Any help is appreciated

 

[neil9999]

 

[neil9999]

 

[Colin_T]

If the algae wipes off in sheets or a film and smells musty mouldy, it is blue green algae (Cyanobacter bacteria). If it doesn't wipe off easily it's probably black beard algae,

The microscopic organisms look like protozoa.