Rated 4.5 out of 5 by 2
Rated 4 out of 5 by Soliloqui Good bio-balls
I bought these for a DIY airlift filter (using PVC pipe) and needed smaller sized balls. The description indicates that these balls are 3/4" in diameter. This is incorrect. The actual size is 21mm (0.83") in diameter so i had to use 1" PVC pipe for these to fit into.
These bio-filter balls have lots of surface area for bacteria to colonize, much much more than ceramic rings. The surfaces, both outside and inside, have a slightly rough texture which is important since the bacteria will have something to cling to. The multiple channels provide a lot of water flow that allows nutrients to reach and support the bacterial colonies.
The only complaint is that some of the balls are not fully formed. The plastic was not fully injected into the molds which reduced the amount of surface area and is not textured. They still work and won't be seen while inside a filter.
Not all bio-balls are created equal. I originally purchased some other (cheaper) bio-balls but it had a noxious smell so I immediately returned them. It used low quality plastic that leached toxic compounds into the air and water (which may be carcinogenic or mutagenic to your fish), did not have any texture, and had a design that limited water flow. These Marineland bio-filter balls, however, don't have any smell, appear to use quality plastic, are lightweight, are textured, and support large bacterial colonies.
If you are deciding between these bio-balls or other ones, I recommend choosing Marineland. You'll be getting a quality product that you'll know will be safe for your fish.
February 4, 2013
Rated 5 out of 5 by KytW support the bio of the filter very well
These work very well at supporting the biological bacteria that keep the aquarium functioning well. They are very versatile and hardy.
September 29, 2007