Marineland DJ50 Duetto Internal Multi-Filter for up to 10-Gallon, up to 66 GPH

There are 3 varieties of the Duetto filters. They are:

Mini up to 10 gallon 2-40 GPH 2-1/2" x 1-3/8" x 5-3/4"

DJ-50 10 gallon 13-66 GPH 3-1/4" x 1-1/2" x 5-1/2"

DJ-100 20 gallon 27-92 GPH 3-1/4" x 1-1/2" x 7-1/4"

These filters have all the necessities: a prefilter/mechanical, a biological filter, a carbon/chemical filter and an air intake that allows the air to mix with the water that comes out of the spout. It is also an extremely quiet filter as long as you keep the pour spout below the water line (to prevent the sound of the water splashing). The only slight problem that I can find is that a tiny amount of air leaks around the seal between the filter media container and the top section, but this isn't a big deal since the water level will almost always be lower then this seal. It's also an efficient filter that produces less heat then most others.

You can use the filter as a pump by removing the pour spout and plugging in a hose that has an inner diameter of 1/2".

I've used this filter in a few nano-reefs and other very small tanks with great success. You can pack your own media in it. I've even opened up the charcoal pack and put my own media in that. It comes with a few output spouts and has an optional venturi for aeration. In my mind, it comes with way more features and configuration options than you would expect for a filter this small.

I use this when a hang on the back filter is too big, too powerful or just can't be used. On my 2.5 gal nano-reef a hang on the back would have dominated the tank, created too much water flow and would have made it impossible for me to put CFLs on top for my corals.

I wouldn't expect miracles from this thing. It's rated for up to 10 gallon tanks but if I had a 10 gallon community tank, I would use this as a supplement to a hang on the back or undergravel, not as the only filter. I love how it removes particles from the water. If you use the stock carbon and sponges it does great.

As with any filter that uses a sponge for biological filtration, clean it only in water you removed from your tank. Don't wash it in the sink with clorinated water and NEVER wash it with soap. You want to leave the helpful bacteria that are living on it as undisturbed as possible. I bought a few spare pre-filter sponges. When one gets filthy enough, I let a new one soak in tank water and then replace the old with the new. This does not disturb the bacteria living on the "bio media" sponge.

Bottom line, use it when a hang on the back won't work or as a supplement. Yes, you can keep it dead silent by keeping it underwater with no venturi but if it's the only filter in your tank, let the spout be above the water line to agitate the surface for oxygen exchange.

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I have a 5-gallon planted tank and had plant debris all over the place even though I had an internal filter that was supposed to be strong enough to take care of it. I got so fed up with having net out junk that I look up other possible filters. Well this little gem is amazing! I could see the difference in just a day!

It's completely submersible and has an adjustable flow rate (perfect for me since my tank is a betta fish tank). I have mine almost maxed out in flow and my guy doesn't seem to mind it. I have the spout facing one of the walls to help dissipate the flow as well. It has the option to aerate the water, but my betta didn't seem to like it, so for now it's not being used. I really like how it is an option though, essentially making this a filter and air pump all in one. You can have the spout fully submersed and still have the aeration as it comes with a little attachment that will sit above the water level to pull in air.

As for replacement parts, I found them at my local PETCO for a decent price. I've read reviews of people opening the carbon compartment and replacing it with their own media, but I haven't tried that yet.

Overall, a GREAT filter! I highly recommend it for nano tanks as it's relatively small and has so many options.

Read Best Reviews of Marineland DJ50 Duetto Internal Multi-Filter for up to 10-Gallon, up to 66 GPH Here

Was using only an undergravel in a 5 gallon circular tank with one fish in it. Too much biological and not enough mechanical filtration. Had to partially change water weekly. Pain in the .....

Bought this. Great little unit that can stick to the curved plastic. Not too obtrusive in such a small tank. Filters like a champ. Not as noisy as the external small air pump I had feeding the undergravel filter. Super easy to clean and service.

The only con I can find is the air mixing valve is darn near impossible to get set right. It either mixes in LOTS of air or none.

That being said I would buy again and highly recommend.

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Simply put, the very best submergable filter on the market, it is not designed to clean up after turtles. If you use it for that purpose, clean it, at least twice a week. I don't use it for that, but I've seen people complain about that.

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