The US sensors are present in the antennae of Mosquitoes and genetalia of Cockroaches. US emitted by the Repeller will scare away the pests and confuse them. Ultrasonic sound will create stress on the nervous system of insects and jam their own US frequency.
South America also houses several larger river cichlids. These species will often get along well in aquariums. For example, various species of freshwater angelfish and the discus fish make great tank mates.Both species prefer soft, acidic water and, importantly, grow to about the same size.frican cichlids prefer hard, alkaline water. Most are very aggressive, but in a large tank, dissimilar-patterned species can get along. You do want to avoid keeping closely related species together, since they may produce undesirable hybrids. For example, no two Auloncara species should share an aquarium.
The Pike Cichlid Crenicichla lepidota was described by Heckel in 1840. Other common names it is known by are Two-Spot Pike Cichlid and Comb Pike Cichlid. They are found in Paraguay drainage from Brazil to Argentina and on the Rio Grande do Sul coast of Brazil. They are found in the middle and lower parts of the Uruguay River in the parts that run through Brazil and Uruguay.