I started this in the tank last night and had hatched shrimp as quickly as this morning. I was pretty surprised. It seems to be working, but the babies haven't discovered the exact source of the bbs yet, but I think when they do, it'll be awesome. All I have to do is add salt and eggs, turn on the air stone, and let it feed my babies! I might even get another one so I can start it a couple days before I remove the other one for cleaning and to restart.
The only cons I would say I've seen so far is that unhatched eggs are slowly drifting toward the exit into the tank, and that hatched shrimp are only slowly exiting the unit. I think I could solve that by simply attaching it to the front glass so that the light is only hitting the exit side, rather that over the whole unit because it's parallel to the light right now. I'm also not looking forward to my next water change, as there is a water line on it that must be maintained at all times to prevent salt in the hatchery from entering the tank. The salt amount is very small, so it probably wouldn't be a big deal anyway, but I don't want any eggs or shells getting into the tank.
Eggs are added to the chamber at the upper left and slowly drift into the larger opaque hatching chamber where the drift in the bubbles. You can shut off the air to allow them to swim into the clear collection chamber, where they are drawn by the light to swim out the exit and into the tank. I haven't tried shutting the air off though, as there are already some eggs and hatched shrimp in the collection chamber. Tank temp is 84*
I'm giving it a 7/10 so far.
