[Dirk]

Even if you just have a trio, I doubt a single mosquito will make it to maturity.

The filter is pretty simple. Started with a Tupperware container about 3"x4"x6". Cut out a 1"x2" hole at the bottom and covered it with the plastic grid used for cross-stiching. Used a 150GPH powerhead inside, cutting a hole at the opposite end just big enough for the cord to stick through and the top of the power head to stick out. I used silicon to seal it up. Filter media are polyfill and ceramic disks. Since the main reason for the tub was to raise fry, I wrapped the entire filter with a pantyhose toe and tied it off with a nylon tie. It's ugly, but it works great.

I've since made a second version that looks better and is more effective, but is over-engineered. I may do a third version this summer and document it.