A few weeks ago my daughter brought home a baby crawfish she had caught and asked if she could keep it. It's been a couple of years since I took down my last aquarium (a 75 gallon sunfish tank) but we have small Beta tank she used to keep a Beta in so I figured we would set it up for the mudbug. I had recently been seeing some attractive fish while fishing a small retention pond so I thought we'd go catch one or two of those to put with the crawfish. My daughter and I went to the pond with a dipnet and caught a number of what I discovered are Golden Topminnows, they are really pretty with the males red tail and the golden flecks along the flanks of the females. Looking at the size of the topminnows I knew that little betta tank wouldn't be big enough so we popped into the pet store (which is right in front of the retention pond) and grabbed a 20 long tank, stand, hood and light and a filter and brought it home along with the minnows to find the crawfish dead. I set up the tank with the topminnows in it and started reading about them and saw that they are tolerent of brackish water, so I immediately thought "Sailfin Mollies". This past Sunday I took my daughter crabbing, and in addition to 126 delicious crabs, she cast netted a bunch of pretty sheepshead minnows and we dip netted a bunch of sailfin mollies. So 2 weeks and about $250 after starting with the idea of keeping one baby crawfish, my kid now has a really cool brackish tank of topminnows, sheepshead minnows and sailfin mollies, plus a few grass shrimp, all that she helped collect.