

However, in the enclosed environment of the aquarium, allelochemicals can quickly build up, with various effects on some plant species. Only when a particular species is grouped over a wide area can a noticeable effect be seen. In nature, although these chemicals may be produced in abundance, they are often diluted in effect where a single plant is concerned. they cannot run, move or fight in the traditional sense).

Plants depend heavily on allelochemicals because they are unable to defend themselves in a movile way (e.e. In the case of plants, these chemicals (called allelochemicals) are often readily produced to inhibit the growth of other plants or alage, or to prevent animals from eating the plants. "Allelopathy describes the production of chemicals by an organism that adversely affect another organism and/or advantageously affect itself.

Here's a little information on it taken from Encyclopedia Of Aquarium Plants by Peter Hiscock: One of the lesser known things that can stop aquatic plants from growing is call Allelopathy. Sometimes this is due to lack of lighting, incorrect substrate or many other common factors. Often there are posts where a person just can't get a certain plant to grow for no apparent reason.
