Just to let you know, this is something I have recently found out. Normally many people thing that the reason some people overcrowd fish is lack of knowledge or if like the pet store misinforms them. However another reason, especially for betas (who should have at least 5gallons) is often the tanks for sale. I went to the pet store getting my 55, and say a beta tank, 1 quart, divided in 2 for 2 beta fish. Thats a pint of water/beta, thats terrible for the beta's. Thats it. Try not to work with these companies and fix thing.