ok, so i had a 10 gallon tank before, with a few fish. they got sick with ich and all died but 1. so i got a new tank (55 gallon) filled it up, put some decor in, and went to the sotre to get some more fish. i got 3 male creamsicle mollies and put them in with my survivor (zebra danio) two of the mollies died a day or two after i put them in. so now i just have the zebra and the creamsicle swimming in a 55 gallon tank. What type of fish should i add in with them?