Crossword Genius

Marlin maybe has tricky task with Nemo initially in aquariums (4,5)

Ross

I believe the answer is:

fish tanks

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'aquariums' is the definition.
('fish tank' can be a synonym of 'aquarium')

I can't explain the remainder of the clue.

Can you help me to learn more?

I've seen this clue in The Guardian.
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