But bigger tanks can hold all the bigger fish we all have dreams about having, or have. For instanse my clown loaches. Ture they are mor expensive but they are easier to keep things stable. To maintian a larger tank really depends on the stock. As for more expensive for stock, just get a couple guppies and wait.freddyk said:Just because you can get a good deal on a big tank, doesn't mean it's wise to buy it. Larger tanks are more expensive to accessorize, more expensive to stock, more expensive to decorate, and more expensive to maintain. It is not a one time cost we're talking about.