Resetting Tank after Death

[Jane]

I had a betta in a 3.5 gal tank. He died this morning, but he had been sick and bloated with fluid for 3 months. I was told it was dropsy. I treated multiple times with Kanaplex, epsom salt baths, and Cory’s aquarium salt treatment over the last three months.

My question— How long do I need to wait before getting a new betta. I had done a 30% water change a couple days before the death so 30% of the salt has been removed. I would like to do a 95% water change with a good gravel vac. Put plants and snail back in to clean up the algae and eventually a new fish. The betta was very bloated with liquid but never did pine cone, not even at the end.

[Fishkeeper125]

I don't think dropsy is contagious, so you can add a new fish whenever.