eventually you will have to Kreem the tank, ---- Words from experience.
I had both my tanks cleaned kept them topped off as best as i could, pending on the the amount of beverage consumed and if i was able to get the gas hose in the hole at night just didn't sounds right.
Long story short, eventually it rusted up again, my rust wasn't bad, but it was enough to clogged the filters in line and in the carb. A carb rebuild and filter replacement was in order, something you really don't want to have to do when out playing in the sand.
It might be in your best interested to kreem the tank, at least it will give you a peace of mind knowing that rust or clogged gas filters isn't an issue.