I have a 55 gallon tank with one violet goby, one balloon molly, and three nerite snails. I have read online that ceylon puffer are peaceful and that they could be paired with mollies and gobies. If they shouldn't be placed in my tank what else would be good options? I like invertebrates, but mainly I would just like something that I could look at. My molly and goby hide all day, so it looks like I have a tank with three small snails and nothing else.