A couple days ago, I took a sample from one of my ecospheres to look at under the microscope. In some ways, it isn’t the best microscope – it is a cheap USB microscope, and while its imaging capability is okay, it is so unstable that turning the focus knob causes it to move its field of view.
Anyway, the reason I did this was to try to identify some very tiny crustaceans. At first, I had thought they were Daphnia, then speculated that they might be nauplii of the copepods, but I couldn’t see them well enough to be sure. After viewing them through the microscope, I believe they are ostracods; but I cannot be sure because they are averse to light and quickly move out of view. I was unable to get any pictures of them. There were also some even smaller things, that just looked like transparent ovals swimming in a helical path, and some kind of green oval swimming, smaller than the ostracods, but bigger than the transparent ovals.
The thing is, I don’t want to harm them just for the sake of a photo. I put all the samples back after the session was done. Is there a way to slow their movements enough for a photo without harming them? Please try to keep your suggestions low budget.