A few ideas
I would be cool if the fish pecked at the coral once in a while, like
real ones do. How about having some little worms wiggling out of the
coral and the fish occasionally tugging at one and eating it? Feeding
in and around a sea anemone with the tentacles slightly closing would
be neat. How about an octopus or a Moray eel? Some sand worms working their way through the gravel next to the glass would be interesting too. One more thing, some of the fans should wave a little like the current was moving them.
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