Hey - Let me first say that this thing looks cool in your tank. . . it seemed like a viable idea when i bought it - the "salt" water doesn't have really much more salt than the water in a standard African Cichlid tank, so even if it does mix with your tank water (which they claim it doesn't) it's not going to hurt your fish.
Setup: easy - not much problem at all - although, the airline that cam with my Hatch n' Feeder wasn't rigid enough to stay connected to the air intake of the corral. The airline kept popping off of the intake. I had to splice in a piece of hard rigid tubing to connect to the intake. Then everything was fine. Pretty easy to setup.
Use: the theory behind the coral seems to be sound, however, in all practicality, it doesn't work as well as a good, old-fashioned do-it-yourself hatchery, so I'm told. The brine shrimp eggs are supposed to stay in the "egg chamber" section of the corral. I found that hardly any did due to the position of the air intake. The air would force the eggs to move forward and out of the egg chamber into the section below the tube where the shrimp were to swim out. As a result, many of the eggs became stuck to the sides of the corral instead of being suspended in the water of the egg chamber. I am sure that this affected the number of shrimp that actually hatched.
The eggs are supposed to float up to the top of the egg chamber so you can easily remove them. Instead, I found they float up to the top of the tube where the vent for the fish to swim out is located, which makes me a little concerned that these eggs ( and their bacteria) are getting into the tank, and therfore, my fishes' bellies.
I did see shrimp hatch. However, I have no idea if they were swimming out into the tank or not. The instructions vaguely state that "eventually" the shrimp will swim out into the tank, so, as a newbie to this deal, I'm expecting buttloads of tiny shrimp babies to go swimming out to get eaten. Nope. Some made it up the tube to where the vent is for them to swim out, but they pretty much stayed in the tube and went up and down, up and down, as far as I could tell.
I was also a little disappointed with the size of the shrimp. They were almost microscopic. I know that doesn't really have anything to do with the corral, but to the point, I'd like to have a system that would allow me to keep the shrimp fed for a few days, then release a whole slew of them into the tank so that my fish would be easily able to find them. You really can't control when the shrimp swim out with the corral, so that scenario is out of the question.
One last gripe - when I do a water change, the corral slips down and down and down and twists sideways as I remove water from my tank. There is only a single suction cup keeping it from toppling over and releasing tons of shrimp eggs into my tank water.
All-in-all, I'm very disappointed with the corral, and I'm planning on removing it from my tank, and setting up a do-it-yourself model. I know there's more work involved - but not much - and I can get the shrimp bigger and meatier for my juvenile and medium sized Africans.
I would not recommend this well-meaning, but faulty product.