If your fixture still uses starters, I would modernize it.
I'd start by figuring out which tube it takes.
Then I'd try to find for a T8 type tube that physically fits the same: if that can be found, it is preferable. You can also get them as high as 90 CRI which makes for really excellent light, better than even available LEDs.
Once I have settled on the tubes to be used, I would then look for an electronic ballast that is compatible with the tubes. All of them will start reliably, not hum, and not flicker.
Look at your fixture and see whether there is one wire going to each end of each tube, or two. If it has starters, it is most likely two. If only one, you need an instant start ballast. Otherwise any will do.
The difference is that a rapid-start ballast pauses for an instant before starting, but the tubes will last 2-3 times as long; and a programmed-start ballast will take potentially longer still to start, depending on conditions, but will be much easier still on the tubes. Programmed-start is desirable when the bulb is rather hard to get to, or turns on/off a lot.
If you prefer, you can find LED replacement "tubes" that direct-wire, and bypass the ballast completely.