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Diatoms don't "feed" on dinos. But they will take advantage of nutrients made available by dino deaths.
If you don't want dinos, you need to replace them with something, diatoms have volunteered for the job!
Speaking of diatoms, DNA, scale is a headache, and in a pinch, I've used groups of diatoms as scale bars.
For instance, in joti's post the pigmented part of those diatoms is about 20 microns I think.
Dunno how flawed that method is, but maybe it gets within +-50%
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