What can I have in a 4 gallon

I loved a little dwarf puffer i had once. They are inexpensive and full f personality. I have a trio of pygmy cories in a 5g they are very cute and very small.
 
Yah my sis has decided she is going to get a african drarf frog and house my baby guppies till they get bigger :D free nursery happy sis? Too good to be true!
 
Oh and the reason NO is an answer for killifish has to do with the cost and availability
 
you could try having rosy reds, usually sold as feeder fish, but actually a great little fish to have around in a small tank! just make sure to qt them, since they are kept in feeder fish conditions, they are usually unhealthy and/or sick
 
yah too late :D my sis will have something in her mind and never get off it!
 
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