Oase BioCompact 25 Internal Filter for Aquariums – Compact, Discreet Multi-Stage Filtration – Adjustable Flow, Ideal for Small Freshwater Tanks and Paludariums up to 10 Gallons

I have a 60 gallon breeder, which is 4ft long, and am running co2. I have 2 Aquaclear 70's on the back, so don't have an outflow that a canister filter provides, and obviously not able to use an inline diffuser, so needed something to disperse the co2 throughout the water column. I first bought a power head that was just way too strong, so took that out within a few minutes and started searching again. Found this and it's perfect. Pushing the co2 to the other side of my tank, but not flattening or ripping out my plants in the flow. Using it with an atomizer, which is able to be tucked right beside the outflow on this. It's also very quiet, which makes it even better.

The product is useless, and he sent it to me after the agreed-upon date. It arrived exactly as it looks in the photo; I think it was someone else's return.

Hello! Not a lot of online review on this product, was looking for a inside motor filter mostly for pushing water and little bit of filter (I have a lot of floating plants which helps with filteration of water). Found this and was told is silent I originally had the 35 tidal seachem which is suppose to be silent, but i can hear the motor ratting and water dropping sound (is in my bedroom across the room, but it still bothers me as, im a light sleeper). The oase 25 filter is small, very small, smaller then you think. Takes no room, but it has very powerful impellers motor so pushes water a lot, i can see my betta riding the waves across the tank. The nozzle can be rotated to change water flows if u want it lower, but i find having it on high allows one side to have high flow while other half of my tank to have lower flow. Not a lot of water filter media inside cause is very small, so you will need live plants or just do more water changes if u go that route. Personally I recommend getting floating plants like water lettuce, they eat a lot of the bad stuff in water and keep your water healthy for fish for low maintenance. The picture is only half of my 10 gallon in comparison, so realistically what a 5 gallon will look like. This filter is great if you want a completely silent filter, i can barely hear it when i have my ear up on my tank, thats how silent it is. Also great if u just wanna add water flow to avoid dead spots in tank. (Im doing a similar walstad like tank with deep substrate and a lot of plants for low maintenance). I personally really like it. It’s exactly what i wanted for my tank, is slowly coming together. Also i have 2 nerite snails, 3 ghost shrimps very active, 1 halfmoon female betta, and what used to be 7 blue shrimps, i saw 3 of them get mauled and eaten by my betta, so they just became expensive food for my betta :( . I think ghost shrimps are just smarter and way they are doing very well, i also added a flat wood with underneath dug out to give the blue shrimps a chance, haven’t seen them in a while, but i see new corpses appear from time to time so not good. I think ghost shrimp are just smarter and bigger so they face the betta and the betta respects them to not try anything funny, but blue shrimps just stands there and gets their back grabbed and gg. All 3 of my original ghost shrimps thriving while blue shrimps are getting mauled. Feels bad…

Wonderfully quiet. Low power, low noise. Variable flow rate and easy to clean every month or so. Usining them in sub-5-gallon tanks and looking to buy more.

I have several planted nano tanks, 4 to 7 gallons and bought 3 Oase Bio25's. They are very adjustable, and placed high on a shallow rimless, it breaks up the protein scum and moves the frogbit about nicely. I have a betta, chili rasboras and oto's, etc., and have zero issues. You just need to turn down the flow or deflect the water upward or towards a wall or at plant roots. The filter is very easy to clean and it really does an amazing job clearing out any mess when you disturb or clean the substrate. Another nice option: you don't have to attach the suction cups. I have these perched on a slate platforms in the corner of my rimless tanks, which makes it very easy to remove for cleaning. In one of my deeper tanks, it sits on an acrylic plant platform.

At the points where the suction cup is connected, they were broken and it prevents the water from coming out efficiently by having it leak out the back

This filter is tiny and perfect, simple yet good flow. Totally silent. I Love it! Seems great quality.

I tried using this in a terrarium when I noticed water was coming out where the moter head connects to the body, I order a replacement and the same issue. I think they needs a seal between the power head and body. Others it's a great little filter

Lo uso en paralelo con un filtro de cascada para un acuario de 28 litros aproximadamente. Me ayuda mucho a mantener el flujo del co2 en todo el acuario

I wanted a low flow filter for my fish tank which is a cubic 30x30x30 (cm). With this filter you can adjust the flow which is perfect for small fish and ideal for my betta fish. You can direct the flow in different directions with the added attachment and the filtration has been perfect for my tank, keeps it nice and clean in between water changes and when re-arranging my live plants. This filter is also very quiet which is perfect as the tank is situated in a bedroom. I would be careful when the handling of the filter, but it’s fine for me i just delicately wash the parts. Overall, impressed with this little filter.

absolutely love this thing, great for anything 5 gallons and under. relatively slower flow but thats ideal when dealing with nano tanks. also extremely sleek and not an eyesore.

Neat little filter 👌