The phrase "a tank at a" is not complete and lacks context, making it difficult to determine its correctness in written English.
It could be used in a context where you are describing a location or situation involving a tank, but it needs additional information to be fully understandable.
Example: "We spotted a tank at a military base during our visit."
Alternatives: "a tank in a" or "a tank on a".
Trapped off the coast of Maine, he was shipped to Manhattan and dumped into a tank at a posh Upper East Side seafood restaurant.
The storm, one of several that affected four Southern states, touched down in Louisiana, where, according to The Associated Press, it damaged a tank at a chemical plant in Tallulah before crossing the Mississippi River about 11 30 a.m.
Ranbaxy has since halted all production of the drug, and the company told The Wall Street Journal this week that it believed the cause was splintered glass from the lining of a tank at a plant in India.
The cold war-set fantasy thriller stars Sally Hawkins as a mute cleaning woman who discovers a bizarre aquatic-human hybrid in a tank at a secret government lab, and helps it escape.
The firewater released during last month's leak - from a tank at a sewage works, near Radlett - was not as severely contaminated, because it was made up of rain and drainage water collected from outside the bund.
(And yes, I've found myself buying gas half a tank at a time, fondly hoping that when I pull up to the next pump, prices will have plummeted to where they should be, or where we want them to be).
Hicks later traveled to Afghanistan and trained with al-Qaeda forces, met bin Laden and secured a tank at an airport in Kandahar, according to the U.S. government.
"You can put that into a storage tank that would look much like a tank at an oil refinery," Murphy said.
The pilot spots a tank at the cemetery entrance, a potential target.
It was a dream Griffin realized in a tank at the Seattle Marine Aquarium, which he owned.
Something over a year ago, a tank at Union Carbide's chemical plant in Bhopal, India, sprang a leak.
