Some Betta's are made to spend their (short) lives in a cup. The are fine in a cup for a few days but don't get used to it. They need heat and food so keep him in a warm place where you can feed him and monitor his health and temperature. Maybe you shouldn't have bought the Betta before your tank was ready. read more
I did notice some stores have some decent sized cups though (not that it's much better, but a hair) you could always put the betta in just a larger piece of glassware/tupperware thing for a day after figuring out the water situation. read more
(07-20-2014, 01:09 AM) Treeca86 Wrote: Betas are fighting fish and can NOT be kept together, they will kill each other. Betas won't get much bigger than those containers in the time it takes to sell them, unlike the goldfish who grow quickly. read more