Activated carbon has been well known in the aquarium industry for years. Its simplicity makes it one of the best-selling filtering materials despite newer solutions constantly appearing. Nevertheless, opinions about activated carbon remain divided. Fishkeepers who use activated carbon do so because they feel it is the ideal medium to use continuously within a healthy aquarium. In modern filters, activated carbon is one of the best chemical filtration mediums for fresh and saltwater aquariums.
In the aquascaping world, there is a discussion about whether the Jack Dempsey is an attractive fish from the hobbyist point of view or not. One claims that this is first-rate fish species that amazes people by its appearance, and others look at this freshwater fish with contempt. There is no accounting for taste. However, are those extreme opinions justified? One thing is sure: you can't stay indifferent while talking about the Jack Dempsey fish.