Penn-Plax AN2 Aqua Nursery and Hatchery Breeding Box for Your Aquarium - Help Protect Baby Fish from Predators

This thing really works. Once you attach it to an airline tube, it really does draw the fry down and into the other chamber. I left a guppy in it one night when I noticed her in labor and woke up the next morning to find the small chamber full of fry. My next attempt will be with a cauliflower sabertail (swordtail) that is VERY valuable.The side chamber doesn't like to sit well though. And most of that is because the tube connecting the two chambers is often too long, leaving the side chamber too far out. So you'll want to cut that tube down a bit so the side chamber sits properly. The lid on the larger chamber also needs to be SECURELY in place, or the fish can freak out, bump it, and knock it off.My only real problem with this (and with many breeder "traps") is that they are so small. There isn't enough room for the poor females to swim around. Mollies and swordtails basically have to stay still the entire time they are in there. So if you don't know *when* they got pregnant, you probably have to leave them in there for days or weeks - or hope you catch them when they first start going into labor. There needs to be a larger version, or perhaps several V-shaped traps can be attached together to fit a particular tank (like a 10-gallon) so the adults have the top of the tank and the fry slip through to the bottom.Aside from the size, this is definitely an efficient way to save the fry of very valuable fish. I'm sure it would work for scattering egglayers too (like tetras and danios) but I haven't tried it yet.

I was a bit skeptical given some of the reviews, but this thing worked perfectly for me. Everything fit together snugly--no rubber bands needed!The only tiny hurdle was that the tube that moves the fry from the main chamber to the side one was indeed at little too long, causing it to kink. Trimmed off the extra quarter of an inch with regular scissors in about thirty seconds. I'd rather it be a little too long than not reach across. And of course watch out for back flow to the air pump since this is likely to be sitting higher up. I put in a check valve just in case and had no problem.I have the tiniest air pump money can buy and the suction was almost perfect. The fry were immediately drawn below the green layer where momma couldn't get at them. One or two made the full journey right away and more a bit later. They have to get right up to the mouth of the tube for the current to be too strong for them to fight, but it was easy enough to shoo the rest through once momma was out, and they were perfectly safe the whole time so I was very happy.This design is excellent. The slits that let water in are very thin, much smaller than they look in the picture because they are tapered from outside to in to encourage flow. This nursery gets excellent circulation and I can't picture any fry escaping.The side chamber is easy to remove--much easier than trying to net a bunch of tiny endler fry, and way less stressful for them! It's been two weeks and I've had zero mortaliy, so this product certainly did it's job.In conclusion, this nursery is a bit of a precision instrument compared to others, but with a little fiddling (almost none in my case) it does a great job ensuring the health and safety of your fry! Beats a box with holes and eagle eyeing your pregnant fish in my book.

Cheaper “built” than a Tupperware from Dollar Tree! Broke the brittle slot for the base of the breeder cup but it usually floats away like “WILLSOOOON”,The hooks aren’t adjustable so it looks like it’s sinking with Jack begging Rose to move over, ohhh and the green V thing (obscures the view but it kinda does it’s own thing swimming with the pregnant guppies soooo! Trust me this thing will frustrate you to where you have to find a priest asap to confess many a “fudges”! Dollar Tree containers & some garden hose would be better quality and take less time putting together

Oh man it's so frustrating to try to use. A slight bump and either the nursery part goes floating across the tank, or the large sections lid floats away, or the whole thing slides down too deep into the tank. It's an excellent idea but needs some troubleshooting to make it more functional. Better hangers/able to use suction cups (even better!), lids that stay on, and sections that don't come apart when bumped.

Product had good concept and idea but very small - This will not fit on my 125 gallon - people saying transfer hose needs trimmed back as of being too long but this isn’t true - If you connect it correctly it’s a perfect size but this breeder box has a few downsides - For starters this box should come with suction cups to hold it in place better - The bottom tray that allows fry to fall through floats up and you will have to weigh it down - The same goes with the lids -In my honest opinion the thought and idea is great but poorly designed - Hard to believe this was designed by Penn Plax as I usually love their products

This not only keeps the babies alive but the bubbler also keeps the fish poop and the extra food clean