Temporary fish problem
So I have a small problem.. this new 4 g I started needs fish else things will be going south soon. I already decided on Celestial Pearl Danios, thought I had them then found out someone bought them out from under me. Now I have a bare tank and need to stock it with something while I find CPD's. Anything I put in there needs to make nice with all the plants, be able to handle no tank heater and once I can get the CPD's I can move them to one of my larger 5 or 6.6 g tanks I have in service already. Here is the rub, both tanks have male bettas so whatever I choose needs to play nice with either or. The 5 is a deeper tank, the 6.6 is a more shallow bookshelf and I think has more places to hide etc. Any thoughts? Whatever I get, I am stuck looking at PetSmart so I cannot get some super uber rare species of fish. Thanks for the help!