Ultra Low Nutrient Systems with Vertex Pro-Bio Pellets
Most of us are now familiar with carbon dosing systems for marine tanks. Having found their start with dosing vodka, sugar and vinegar, they have evolved to a variety of liquid carbon sources that must be dosed daily to the aquarium in order to maintain a balanced bacteria population. With the advent of biologically degradable plastics, bio-pellets broke onto the scene. As their name suggests, these are small extruded pellets, now available in various shapes and sizes, made of a completely biodegradable plastic, which is based on carbon. The very thing we want to offer our bacteria.
These plastics are made via the bacterial fermentation of sugars to produce a linear polyesther of carbon, hydrogen and oxygen. Being a solid, they are not dissolvable in water, rather, they are broken down by other guilds of bacteria, during which process they assimilate nitrogenous wastes and phosphates. Via continuous skimming of the system, surplus bacteria are consistently harvested, thus exporting the unwanted wastes.
As Vertex Pro-Bio Pellets do not simply dissolve into the water, rather require bacteria to consume them, there is no chance of overdosing the carbon source, which is an issue with liquid carbon dosing. With the Pro-Bio Pellets one does not need to continually add the carbon. It is there in a fluidised media filter ready and waiting for the bacteria. This greatly simplifies the carbon dosing method.
When starting with this method, one needs to follow certain guidlines, especially in aquaria with existing high nutrient levels. It is recommended that one begin with about 25% of the final amount of Vertex Pro-Bio Pellets, to allow the bacteria population to slowly rise and consume the excess nutrients. As it is recommended to use approximately 1ml pellets to 1 litre water; a 500 litre tank would finally require 500ml pellets. To begin, one should use only 125ml and increase this amount to the full charge over a period of a few weeks.
Before using the pellets in your filter (we recommend the Vertex Univeral Media filter, available in 1.5l and 2l sizes), they should be soaked in aquarium water overnight. Otherwise the micro-bubbles of air trapped within them will make them float to the top of the filter canister and be ejected into the aquarium, unless a fine filter stops them. After filling the appropriate amount of pellets into the filter, bring the pump flow up just enough that the pellets dance about with no dead areas. More water movement is not required and too much flow will tend to push the pellets against the filter sieve and block the flow.
FAQ
Must I use a skimmer with pellets?
The short answer is yes! The idea of any fitration system is the export of undesirable elements, in this case nutrients. By supporting the reproduction of bacteria, we are supporting the incorporation of nutrients into a removable entity, the bacteria. Unless one has an awful lot of filter feeders removing this bacteria, it will simply die and break back down into the waste product one wished to remove. A skimmer effectively harvests the bacteria and, thus remove the nutrients from the system.
Do I need to feed the reactor output directly to my skimmer?
No, there is no need to do so. The bacteria produced is a food source for many filtering creatures, such as sponges, clams, fan worms, etc, as well as many sps. Removing it directly would be missing an opportunity to provide a natural food for your tank and further support the biodiversity.
Are pellets only for salt water?
No. Pellets may be used in any biologically driven filtration system that requires a carbon source. Ponds, freshwater tanks, even sewage treatment may be handled with a pellet technology.
Can pellets be combined with other systems, such a zeolith-based filtration?
Of course, as they are simply a solid carbon source. Zeolith will enhance the function of the pellets, as well as keep the water very free from fine particles.
Can pellets be used with ozone or UV?
This is not recommended, as both of these filtration aids attack and kill the bacteria. Their use would be counterproductive.
Must pellets be run in a fluidised reactor?
In essence, yes. They must be kept well oxygenated with flowing water. Compacted pellets will develope anaerobic conditions, which is not inducive to NO3 reduction and may produce poisonous wastes.
Are pellets good for FOWLR tanks?
Certainly, and this is an excellent method to control wastes. As the LR will provide a good basis for bacterial guilds, the pellets will be quickly populated by bacteria. Pay special attention to nutrient levels when you start. With high existing levels of NO3/ammonia, which are common in fish-only systems, start with less than 25% of the planned final dosage to allow the levels to come down slowly and prevent a bacterial bloom. Make sure your skimmer is functioning at top efficiency.





