I am about to upgrade my 10 gallon to a 30 gallon. It's dimensions are 30" long, 13" wide, and 19" high. I already have 4 cories and 1 betta in my 10 gallon. I was planning to either put 6 schooling fish (black neons or harlequins), and a pair of blue rams to go with my betta and 4 cories. If I did that, could I add more fish? My second option would be to go with fish that are a little larger. I would still have my betta and cories, but I would add a pair of blue rams, a pearl gourami (do they have to be in pairs?), and maybe a few more medium-sized fish (suggestions)? Which one would work better? Thanks.