FL Hang on Holding and Breeding box, L

If you are a serious fishkeeper or hobbyist breeder, the Fluval Multi-Chamber Hang-On Breeding Box (Large) is hands down the absolute best investment you can make. Traditional internal fabric net boxes take up a massive amount of physical real estate inside your tank, get dirty incredibly fast, and leave vulnerable newborn fry exposed to fish picking at them through the mesh. This clever external, air-driven box solves all of those problems effortlessly. Here is why this Large 1.9-litre system easily earns a perfect 5 stars: • Brilliant Space-Saving Exterior Mount: The absolute best part of this design is that it hangs completely on the outside of your aquarium glass. It leaves your main display tank 100% open for your plants and adult fish, making it incredibly easy to closely observe your pregnant mothers, shrimp, or fry without disturbing the main aquascape. • Air-Driven Continuous Water Circulation: Using a standard small air pump (sold separately), the intake tube continuously lifts warm, conditioned, and oxygenated water from your main display straight into the breeding box. The water then cascades smoothly back into the tank through an outflow weir. You get a constant stream of fresh water without needing to buy an additional heater or secondary filter filter system! • Highly Versatile Multi-Chamber Layout: The large 1.9L model comes packed with removable partition plates that let you customize the setup into 1, 2, or 3 separate housing compartments. You can humanely separate multiple pregnant livebearers, quarantine an injured fish, or sort fry by size so the larger ones don't outcompete the smaller babies for food. • Escape-Proof Outflow Strainers: It includes interchangeable discharge slit plates with thick and thin bars. The ultra-fine strainers completely prevent micro-fry, baby shrimp, or newly hatched eggs from accidentally getting washed over the waterfall edge and back out into the main display where predators are waiting. • Flawless Acclimatization Tool: Beyond acting as a top-tier hatchery, it is the ultimate tool for slowly introducing new arrivals to your water chemistry. By letting your main tank water cycle smoothly through the box, new fish or shrimp can adjust to your water parameters completely stress-free. ⚠️ Essential Setup Tip: Because the water circulation is driven by air bubbles lifting water up the intake tube, it can make a light trickling sound. If you want it to run completely whisper-quiet, just drop a small piece of coarse filter sponge directly into the intake chamber to diffuse the popping bubbles! The plastic is crystal clear, the leveling feet keep it perfectly straight against both rimmed and rimless tanks, and the closing lid prevents any adventurous fish from jumping out. If you want to vastly improve your fry survival rates, this external box is worth every single penny. Highly, highly recommended!

Quite possibly the best thing I’ve ever purchased in terms of exceeding expectation. Sturdy, well-designed, functional… I wish I’d bought this before wasting money on DIY efforts and nets. Babies are safe and secure, it’s easy to gaze lovingly at them, there are no fears about parameters… there is nothing not to love about this.

Mounted this on a 120L community tank to isolate fry and a stressed guppy—worked spot-on. It hangs externally, so it doesn’t take up space inside the tank. Water circulates from the main tank using an air pump (not included), keeping temperature and chemistry consistent. No heater needed, no separate filtration—just plug in and go. Setup took about 10 minutes. Suction cups and brackets hold firm, even when full. Flow’s gentle—no risk of fry getting tossed around. I’ve used it for guppy fry, shrimp, and even a short quarantine stint. Easy to observe, feed, and clean. 📦 Features & Specs Capacity: 1.1 litres Mounting: Hang-on design with secure brackets Flow System: Air-lift driven—uses tank water for circulation Compartments: Optional dividers for multiple fry or isolation zones Material: Clear acrylic—easy viewing, solid build Extras: Includes tubing and flow adjuster (air pump not included) 🧪 Performance Water Quality: Stays stable—no separate heater or filter needed Noise Level: Near silent—just a soft bubbling from the air pump Cleaning: Easy to rinse and wipe down—no awkward corners Visibility: Clear sides make it easy to monitor fry or isolated fish 👍 Pros ✅ External mount—saves tank space ✅ Gentle flow—safe for fry and shrimp ✅ Stable conditions—uses tank water ✅ Easy setup—no tools needed ✅ Optional dividers—customise layout 👎 Cons ❌ Air pump not included—must buy separately ❌ Limited size—best for small fish or fry ❌ Needs level tank edge—check fit before mounting ❌ No lid—watch for jumpers or evaporation 🧭 Personal Verdict If you’re breeding, isolating, or just want a clean way to manage fry without stressing your main tank, this box is a tidy bit of kit. I’ve used it for guppies and shrimp—no drama, no losses. It’s earned its spot in the gear stash.

it works well. I've used it several times now with platys. Thin layer of dark gravel, a bit of guppy grass / java moss, and a pregnant female can go into the breeder with as much as a couple of weeks to go and stay there without getting stressed. It's big enough that fry can get away into hiding. I found that even with the weir / grid thing at the outflow, quite a lot of fry got washed into the main tank, which didn't actually cause a problem given it was a shrimp tank, but obviously would depending on the tank's inhabitants. I guess a piece of foam might keep the fry from washing over if that was a concern. The downside is the airlift, which is noisy / gulpy and not the most efficient. I keep meaning to find a small water pump to move the water rather than the airlift, but haven't got round to it. There's a bunch of youtube vids with hacks some of them to quieten the llow. That said, it does work, it's quick and easy to set up, equally to take down and clean. I wouldn't consider anything but the large one.

It is OK . . . I like that it comes with cleverly designed spacers to change the angle at which it hangs, so you can hang it vertically no matter the thickness of your tank's trim. I also like that it seems pretty tough and the plastic is clear. Sadly the air lift was both very noisy and inefficient. I solved this by attaching a micro pump to the inlet via some tubing, but this was way too strong as it is only 2 litres and even a tiny pump will do 50-100 litres per hour. Easily fixed with a couple of drilled holes in the tubing to deliberately make the flow less efficient. This now works well and is extremely quiet. Second problem is that the "grill" that prevents fry from being flushed over the "water fall" return has slots that are far too wide for smaller fry. The obvious solution is a bit of filter foam, BUT you do have to be very careful: Use too coarse a foam and your fry will get stuck in it, but use too fine or too thick a piece of foam and you slow the outlet too much and then its over spilling along the length of the box. If you have hungry fish in your main tank this could be disastrous! It took a lot of experimenting (some pretty fraught moments!) too get a piece of foam just the right PPI and thickness to make it fry safe. I will be experimenting with fine netting material in future as I think this will be less obstructive to water flow but ensure fry are safe at the same time. By the way, with a pump attached the throughput will clear the tank of baby brine shrimp too quickly so I put it on a timer to just run for 30 minutes every few hours, giving the fry ample time to eat. I'm aware I've probably over complicated what was meant to be simple, but the noise from the air lift was way too loud to live with.

This worked really well! Has so far held up to two rounds of fry and is still going. Is slightly noisy but not so loud that you can’t ignore it. Great value for money and a really good size for initial fish fry. You would still need a grow out tank for a large fry birth but great to start.

I used this to make a hob refugium, covered with black tape added a very small pump and cheeto it works very happy.

Honestly the best ever breeding box i have ever purchased space savings hangs on the outside once connected to air supply fills itself. No instructions needed self explanatory up and running in 5 minutes Recommend purchase will be buying another

I have tried different types of breeding boxes and I consider Fluval holding and breeding box the best among them. It has everything that you need for an aquarium hobbyist. The size is very convenient comparing to others while I wish if Fluval can make a bigger size also. This is a complete set and you won't regret buying it. I highly recommend it.

İçinden hortum ile bağlantı plastik çubuğu çıkmadı iade edildi.

This breeding and holding box has been a fantastic addition to my aquarium setup! I really like having the option to create up to three separate compartments, which makes it incredibly versatile for isolating fish, protecting fry, or keeping smaller fish safely separated. The large size provides plenty of room without taking up excessive space in the tank, and the multi-chamber design makes managing multiple fish much easier. It feels sturdy, well-designed, and practical for breeding and quarantine needs. Definitely a great addition for any fish keeper who breeds or needs a reliable way to separate fish. Highly recommend! 🐠🐟❤️

The concept of this product is really good! Very useful in raising baby fish!

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