Dunno, I did about 8 years at Wal-Mart, this is my guess at what it takes to have a good aquarium department at a big corporate box store:
First you need a dept manager who is actually into it, and does not want a promotion.
They will need at least one employee mostly under them who is also into doing a good job.
Now for the hard parts
You will need salaried members of management who are okay with a dept having two whole employees who are actually allowed to work in their dept the vast majority of the time. (normally only the meat dept, hunting/fishing desk and garden center in AR, pets has not had a dedicated person at all since a couple years before the pandemic)
Once things are going well you'll need regional managers who won't see this and then slash staffing by 75%
There will have to be an actual usable budget for replacing broken things, or your good but misguided dept manager sneaking in functional things behind the Salaried Members of Managements back out of their own .50$ above minimum wage pocket.