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In new setups, heterotrophic bacteria get to work faster then the nitrifyiers, which in consequence leads to an accumulation of nutrients. In some cases the scavengers cause the water to become cloudy, which in this case is a bacteria bloom.

Kallis Devi, need ääremärkused on äärmiselt täpsed ja pädevad antud teema terminoloogia osas. CO2 puutub sellepärast teemasse, et kasutad terminit heterotroofne bakter. Ja sinu "toodab ise orgaanilisi aineid lihtsatest ühenditest" ei tähenda ka muud kui seda et süsinikuallikaks on CO2 või siis selle vees lahustunud vorm, kui nüüd päris juuksekarv ka lõhki ajada.

Nitrifitseerivad bakterid on samuti heterotroofsed bakterid.

There are a range of autotrophic and heterotrophic bacteriacapable of nitrification. Unlike heterotrophic bacteria, autotrophs are dependent on this reaction to generate energy for cell maintenance and growth. In wastewater treatment systems, autotrophs constitute only a small percentage of the mixed liquor microbial community, but they are responsible for the bulk of nitrification .

In wastewater treatment systems, the genera Nitrosomonas (an ammonia oxidizer) and Nitrobacter (a nitrite oxidizer) are the two groups of autotrophs presumed to be responsible for nitrification.

As mention in the opening paragraph a simple process such as cleaning the gravel can touch-off a bacteria bloom which turns the water milky white. Why? Many hobbyists think this is a bloom of nitrifying bacteria in response to ammonia being produced in the tank. This is not correct and, besides, ammonia and nitrite-oxidizing bacteria are too slow growing to cloud aquarium water. The autotrophic nitrifying bacteria double every 27 to 33 hours in good conditions. Heterotrophic bacteria, on the other hand, can divide every 20 minutes. What actually happens in that over time when the gravel in the aquarium is not disturbed certain chemicals start to accumulate in areas of the gravel and are basically trapped there. In many cases, these areas are anaerobic (meaning devoid of oxygen). In these areas, the further decomposition of the chemicals cannot occur due to the absence of oxygen. However, when the gravel is stirred up by gravel washing these chemicals are released to the water in the aquarium and become nutrients for the heterotrophic bacteria which quickly increase in number causing the water to become cloudy.

Vaataks seda minu purgi näitel sest lähemaid näiteid pole hetkel võtta (loodetavasti!).

Key Points

True nitrifying bacteria are strictly aerobic autotrophs. They can only use nitrogen from inorganic sources such as ammonia and nitrite. Nitrosomonas (ammonia-oxidizers) and Nitrobacter (nitrite-oxidizers) are the most common.

Heterotrophic bacteria are generally considered to be organic sludge degraders. They are mostly from the genera Bacillus and Pseudomonas. Most of these are facultative anaerobes; meaning they can function with or without oxygen. They will do completely different functions depending on the level of dissolved oxygen present.

Heterotrophic "nitrifiers" prefer to obtain their nitrogen from organic sources such as decomposing organic debris. Those that can convert ammonia do so only when an organic nitrogen source is not available. This is unlikely to happen in an aquarium or pond where fish are present. The explosion of "nitrifying" bacteria products in the industry is due to research that some heterotrophs can use ammonia-nitrogen. However, this is under ideal laboratory conditions.

Heterotrophic "nitrifiers" generally cannot utilize nitrites. Only a few species are capable of reducing nitrite to free nitrogen, but, under strictly anaerobic conditions.

Scientific studies indicate that, depending on species, between one thousand to one million heterotrophic bacteria cells are required to perform the same ammonia conversion rate as one Nitrosomonas bacteria cell.

Fritz-Zyme #7 has a cell count of 30 million bacteria per ounce, 50% of which is Nitrosomonas and 50% Nitrobacter. To obtain the same ammonia conversion rate, a competitive product composed of heterotrophic "nitrifiers" would require the addition of 15 trillion bacteria. This would probably require several gallons of another product. No quantity of heterotrophic "nitrifiers" would reduce the generated nitrites.

Heterotrophic "nitrifiers" can also operate in the reverse direction; that is they can convert nitrate to nitrite or ammonia, especially during times of low dissolved oxygen levels. In a pond, this could potentially happen during the hours before sunrise when DO levels are at their lowest.

There are no dry forms of any bacterial product that can contain viable Nitrosomonas and Nitrobacter cells. Unlike heterotrophs, they cannot form spores so they cannot survive any type of drying or freeze-drying process.

Sääsevastseid olen söödaks pakkunud küll aga eriti harva.

termin heterotroofne bakter tähistab enamvähem ükskõik millist suvalist bakterit.