>>5021329
>I want to do the summer tubbing thing, but don't have space to overwimter fish.
Bro, tons of the best looking killifish are annuals, so they die off in the winter after laying eggs. The eggs themselves need to go through a dry period before spring rains before hatching and starting the cycle all over again. Pic related. Even if you tried to keep them alive longer, very few people have a successfully kept specific specimens over a year.
TL:DR; grow killifish, let them die as they naturally do during Winter.