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Fish are always, always, moving and that was one of the major challenges in dealing with them as a painting subject.
Even a sleeping fish has gentle movement. Those rippling fins and gills -are floating up and over or out and away...and that's when the little bugger isn't flat-out zipping around the tank.
The solution I came to included movement with plants (when I could) and motion with water (when I couldn't) -Successful? It's up to you kids.