(b) He gave fish food to goldfish in/ at the aquarium.
(c) He had a shoal / a group of goldfish in /at the aquarium.
Top answer
Vincent Teo Can I say, (a) He is feeding goldfish in / at the aquarium. (b) He gave fish food to goldfish in/ at the aquarium. (c) He had a shoal / a group of goldfish in /at the aquarium.
— BarbaraPA
Vincent Teo Can I say, (a) He is feeding goldfish in / at the aquarium.
(b) He gave fish food to goldfish in/ at the aquarium.
(c) He had a shoal / a group of goldfish in /at the aquarium.
I assume you mean "aquarium" to mean a "tank" that a person would have in their home, not the large complex of buildings created for the public to view many types of fish.
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