you show us very interesting animals, but excuse my question: It is possible for you to improve the quality of your pictures, for example by cleaning the lenses of your microscope, by making a good Köhler-illumination etc?
Otherwise it is not possible to make any identification of your animals...
well, I don't find them too bad, but for id certainly not sufficient. Cropping and contrast enhancement would be a start. Besides, at 400x this would be a very small rotifer, it's hard to believe. Looks more like 100x??