I'm almost new to the hobby. I do have a betta and owned a Molly before. I have a 6 gallon tank with a filter) and I am trying to find a fish that can grow in it, without me having to run out soon to buy a bigger tank to accomodate the baby that grew into an adult and doesn't fit the tank anymore. I would like a couple of fish if possible. I see there are some minatures that you can barely see? Is there anything that grows slightly bigger and doesn't outgrow the tank. I do not want a bigger tank. I tried to find some answers but the internet is confusing.