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Collecting a sample doesn't need to be complex. Use your hand or a turkey baster type coral/fish feeding tool to remove some from the tank. Its not a problem if you get sand in there with it. If you find the sand to be problematic when trying to view it with your scope, take your sample and put it in a ziplock bag then shake vigorously for a few seconds. Use some of the water from the bag. Whatever was in the sand will be in the water column now.
If your resolution is really poor on your scope, try paying attention to movement instead of shape. If they are spinning around like a tether ball then it is Ostreopsis. If they are scooting along the surface its probably Amphidinium. If they are really really tiny and just sit suspended in mucous with the odd one swimming in circles then its the tiny guy who looks like symbiodinium that I don't have a name for yet.
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